40% of countries show no progress in reducing cigarette smoking in adolescents over last 20 years

cigarette smoke

Despite an overall reduction in cigarette use over the last 20 years, nearly 1 in 5 boys (17.9%) and more than 1 in 10 girls (11.5%) around the world used tobacco at least once in the past month between 2010-2018, according to a new study published today in The Lancet Child & Adolescent Health journal.

Tobacco use kills more than 8 million around the world every year and can lead to cancer, heart disease, lung disease, and chronic obstructive pulmonary disease, as well as affect fertility. Tobacco use among adolescents and children is a crucial problem, given that most adult smokers start in adolescence or childhood.

In the new study, the authors looked at the Global Youth Tobacco Surveys data between 1999 and 2018 to assess trends in prevalence of tobacco use. All countries included did at least two surveys, resulting in 1.1 million 13-15-year-olds from 140 countries included between 1999-2018, and 530,000 adolescents from 143 countries between 2010-2018.

In the study, the prevalence between 2010 and 2018 of smoking cigarettes on at least one day in the past 30 days was approximately twice as high at age 15 years compared with age 13 years in both boys and girls (6.8% vs 15.4% in boys; 3.4% vs 8.7% in girls). The prevalence of cigarette smoking was highest in the Western Pacific region for boys (17·6%), with Tokelau having the highest prevalence of 49.3%. The European region had the highest prevalence of cigarette smoking for girls (9·0%), with a prevalence of 23.7% in Bulgaria and 23.6% in Italy.

The study also looked at the use of other tobacco products, such as chewing tobacco, snuff, dip, cigars, cigarillos, pipe, or electronic cigarettes.

Between 2010 and 2018, the prevalence of using these products was higher at age 15 years than at 13 years (8.4% vs. 13.9% in boys, 5.1% vs. 9.3% in girls), and there was a significant increase in using other tobacco products among boys aged 15 over the past 20 years, where it rose by an estimated 2.1%. The prevalence of using tobacco products other than cigarettes was highest in the Eastern Mediterranean region (16.7% in boys and 9.0% in girls). The Americas and European regions had the lowest prevalence (7.5% and 9.3% among boys and 5.4% and 5.5% among girls respectively), according to the study. The authors note that they could not distinguish between the different types of tobacco products in this category.

Prof Bo Xi, of Shandong University, China, and lead author of the study, said: “Cigarette use may have decreased in the majority of countries in the study, but there are still large numbers of young people smoking. The fact that in many countries the prevalence of using non-cigarette tobacco products is higher than, or as high as, the prevalence of cigarette use shows us there is still a lot of work to do. The need to strengthen tobacco control efforts, which include specific policies for different tobacco products and a focus on health education for adolescents globally is more important than ever.”

In the study there was varying prevalence of smoking cigarettes and using other tobacco products across different regions, which the researchers suggest was due to differences in how tobacco control measures are implemented and monitored. For example, Uruguay has been at the forefront of tobacco control, with a complete ban on tobacco promotion and advertising and strict pictorial health warnings. As a result, cigarette smoking reduced by 17% per 10 calendar years (from 20.1% in 2007 to 8% in 2014), the authors estimate.

The Western Pacific region showed improvement in the prevalence of smoking cigarettes and use of other tobacco between 1999 and 2018 where it reduced by 6.2% and 4.2%, respectively, per 10 calendar years. The prevalence of cigarette smoking also reduced in the European region by 5%. However, even though the region showed improvement, not all countries within the regions performed as well. For example, Bosnia and Herzegovina saw an increase of 10.6% every 10 years (from 11.7% in 2008 to 17% in 2013). The authors suggest that possible reasons for an increase in smoking in this country and some others could be due to the low cost of cigarettes, poor enforcement of smoking bans inside buildings, weak measures on tobacco advertising and promotion, or the sale of single cigarettes.

There were regions that showed an increase in prevalence of using other tobacco products. In the Eastern Mediterranean region, the prevalence increased by 3.5% and in the South-East Asia region it increased by 3.3% per 10 calendar years. For example, in Saudi Arabia in the Eastern Mediterranean region, the prevalence of using other tobacco products increased by 33.3% every 10 years (from 11.2% in 2007 to 21.2% in 2010). In Bhutan in South-East Asia it increased by 18% (from 7.2% in 2004 to 23.4% in 2013).

Professor Yajun Liang, of the Karolinska Institute, Sweden, said: “The largest reductions in tobacco use were seen in countries which had ratified the WHO Framework Convention on Tobacco Control, highlighting the importance of policy change to reduce tobacco smoking. But there is still a lot of work to be done especially with reducing the use of other tobacco products.”

“The prevalence of using any tobacco product was two or three times higher in adolescents aged 15 than aged 13 in most countries. Peer pressure, the desire to experience new things, and the ability to buy cigarettes could all explain this trend. Fortunately, many countries have implemented partial or total bans on tobacco advertising. However, it is challenging to address advertising or promotions on the internet and on social media. Health education from an early age about the dangers of tobacco remain crucial.”

In a linked Comment, co-authors Mohammed Jawad and Christopher Millett of Imperial College London, UK, and Rima Nakkash, of American University of Beirut, Lebanon, (who were not involved in the study) say that the study “portrays a somber situation” and “[the] findings uncovered a quietly growing phenomenon that has manifested into an urgent priority for the global tobacco-control agenda: the rise of non-cigarette tobacco products.”

They discuss in depth the rise in the use of other tobacco products in the Eastern Mediterranean region and suggest this is due to the growing popularity of the waterpipe (known locally as shisha, hookah, or arghile) as a result of new flavoured tobacco, a thriving Middle Eastern café culture, and the misperception that waterpipe tobacco is less harmful than cigarettes. They agree with the study authors that different policies may be needed for different tobacco products and that existing tobacco control laws are based on reducing cigarette smoking and are less effective when applied to products such as waterpipe tobacco.

The authors write: “Simply extending existing laws to waterpipe tobacco seems reasonable in theory, but in practice is far from adequate and can be unenforceable. In the absence of an effective policy response to the emergence of a more nuanced tobacco-use landscape, tobacco consumption among adolescents will remain high… It is not yet certain whether plateaued trends in cigarette use among adolescents in the Eastern Mediterranean region were caused by increasing waterpipe tobacco use, but it is certainly plausible. At a minimum, rising non-cigarette tobacco use is likely to undermine the progress made in reducing cigarette smoking, and at worst could sizably exacerbate the tobacco epidemic.”

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Could COVID-19 immunity last decades? Here’s the science.

The body builds a protective fleet of immune cells when infected with COVID-19, and in many people, those defenses linger for more than six months after the infection clears, according to a new study.

The immune cells appear so stable, in fact, that immunity to the virus may last at least several years, the study authors said. “That amount of [immune] memory would likely prevent the vast majority of people from getting hospitalized disease, severe disease, for many years,” co-author Shane Crotty, a virologist at the La Jolla Institute of Immunology in California, told The New York Times, which first reported on the study.

That said, making predictions about how long immunity to the coronavirus lasts can be “tricky,” Nicolas Vabret, an assistant professor of medicine at the Mount Sinai Icahn School of Medicine, who was not involved in the study, told Live Science.

“It would be surprising to see the … immune cells build up in patients over six months and suddenly crash after one year,” Vabret said in an email. But “the only way to know whether SARS-CoV-2 immunity will last decades is to study the patients over the same period of time.” 

In other words, we won’t know exactly how long immunity lasts without continuing to study those who have recovered from COVID-19. However, the new study, posted Nov. 16 to the preprint database bioRxiv, does provide strong hints that the protection is long-lived — although clearly not in all people, as there have been several cases of individuals being reinfected with the coronavirus after recovering. 

The research dives into the ranks of the human immune system, assessing how different lines of defense change after a COVID-19 infection. 

These defenses include antibodies, which bind to the virus and either summon immune cells to destroy the bug or neutralize it themselves. Memory B cells, a kind of white blood cell, “remember” the virus after an infection clears and help quickly raise the body’s defenses, should the body be reexposed. Memory T cells, another kind of white blood cell, also learn to recognize the coronavirus and dispose of infected cells. Specifically, the authors looked at T cells called CD8+ and CD4+ cells.

The authors assessed all these immune cells and antibodies in 185 people who had recovered from COVID-19. A small number of participants never developed symptoms of the illness, but most experienced mild infections that did not require hospitalization. And 7% of the participants were hospitalized for severe disease. 

The majority of participants provided one blood sample, sometime between six days and eight months after the onset of their infections. Thirty-eight participants gave several blood samples between those time points, allowing the authors to track their immune response through time.

Ultimately, “one could argue that what they found is not so surprising, as the immune response dynamics they measure look like what you would expect from functioning immune systems,” Vabret said. 

The authors found that antibodies specific to the spike protein — a structure on the surface of the virus — remain stable for months and begin to wane about six to eight months after infection. At five months post-infection, nearly all the participants still carried antibodies. The volume of these antibodies differed widely between people, though, with an up to 200-fold difference between individuals. Antibody counts normally fall after an acute infection, Vabret noted, so the modest drop-off at six to eight months came as no surprise.

By comparison, memory T and B cells that recognize the virus appear extremely stable, the authors noted. “Essentially no decay of … memory B cells was observed between days 50 and 240,” or eight months later, Marc Jenkins, an immunologist at the University of Minnesota Medical School, who was not involved in the study, said in an email.

“Although some decay of memory T cells was observed, the decay was very slow and may flatten out at some point,” Jenkins added. There’s reason to believe that the number of memory T cells may stabilize sometime after infection, because T cells against a related coronavirus, SARS-CoV, have been found in recovered patients up to 17 years later, according to a study published July 15 in the journal Nature

Early in the pandemic, scientists raised concerns that immunity to the virus may wear off in about a year; this trend can be seen with the four coronaviruses that cause the common cold, Live Science previously reported. However, studies suggest that the body’s reaction to common coronaviruses may differ from that to viruses like SAR-CoV and SARS-CoV-2, which hopped from animals to humans. 

“We don’t really know why seasonal coronaviruses do not induce lasting protective immunity,” Vabret said. But the new study, along with other recent evidence, suggests that SARS-CoV-2 immunity may be more robust, said Jason Cyster, a professor of microbiology and immunology at the University of California, San Francisco, who was not involved in the study.

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That said, a few participants in the new study did not mount long-lasting immune responses to the novel virus. Their transient responses may come down to differences in how much virus they were initially exposed to, or genetics may explain the difference, Cyster said. For instance, genes known as human leukocyte antigen (HLA) genes differ widely between individuals and help alert the immune system to foreign invaders, Live Science previously reported

These inherent differences between people may help explain cases of COVID-19 reinfection, which have been relatively rare but are increasing in number, Science Magazine reported.

Again, to really understand how long COVID-19 immunity lasts, scientists need to continue to study recovered patients. “Certainly, we need to look six months down the road,” and see whether the T and B cell counts remain high, Cyster said.

Should immunity be long-term, one big question is whether that durability carries over to vaccines. But natural immunity and vaccine-generated immunity cannot be directly compared, Vabret noted. 

“The mechanisms by which vaccines induce immunity are not necessarily the same as the ones resulting from natural infection,” Vabret said. “So the immune protection resulting from a vaccine could last longer or shorter than the one resulting from natural infection.”

For example, the Pfizer and Moderna vaccines use a molecular messenger called mRNA to train the body to recognize and attack the coronavirus. No mRNA-based vaccine has ever been approved before, so “we practically know nothing about the durability of those responses,” Cyster said.

“I think [that’s] the big unknown for me, among the many,” he said.

But while some unanswered questions remain, the main takeaway from the new study is that “immune memory to SARS-CoV-2 is very stable,” Jenkins said. And — fingers crossed — perhaps those hopeful results will hold well into the future.

Originally published on Live Science. 

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These Fruits and Veggies Could Last Months When Stored The Right Way

Any smart shopper would want their fresh produce to last as long as possible. If it doesn’t go bad fast, it means you can save more money because fresh fruits and vegetables can be pretty expensive. Having to throw away rotten ones and restock again can hurt your food budget and is also wasteful.

According to the Environmental Protection Agency, around 94% of food thrown away end up in landfills. This could be lessened just by knowing the right way to purchase, store, and prepare your fruits and vegetables so they will last for as long as possible. But you can also opt to stock up on these products that could last for longer than you would expect, as long as you store and use them correctly.


It’s ideal to store potatoes in 40 degrees Fahrenheit. These veggies don’t like light, so the perfect storage conditions for potatoes is in the basement or a cellar. Light can also make them turn green.

Storing potatoes in this condition keeps them from rotting for around 2 to 4 months. However, keep them away from apples and onions as both of these food items emit gases that could make potatoes ripen faster.


Although cabbage tastes best when it’s fresh, it can also last for up to 2 months if you plan to stock up on it. However, it should be placed inside the fridge and wrapped in plastic. Since cabbages can last longer than lettuce or other delicate leafy greens, it can be used as a stand-in as an ingredient of your salads. Most greens that are frequently used in salads wilt in a matter of days because of their high water content.

Cabbages can be alternatives to salad greens that wilt quickly.


According to the University of Maine, no other tree fruit could last longer than apples and pears. Under the right conditions, these could last up to 4 months. Apples could thrive in a storage temperature of around 32 degrees Fahrenheit, except for the Honeycrisp variant that should be stored at 36 degrees Fahrenheit because it tends to get a chilling injury.

Among your bunch of apples, consume the largest one first since these are usually the first ones to go bad. Store apples inside a plastic bag and stow it inside the fruit crisper drawer of your refrigerator to prolong it for weeks. Just make sure that you keep them away from veggies. Other vegetables ripen faster when exposed to ethylene gas, which apples emit.


Beets can be used in a variety of ways. You can slice them up for salads or snack on baked beet chips. It’s a good thing that these veggies can last between 2 to 4 months in your refrigerator if stored properly. If there are still greens attached to the beets, make sure to remove them. After that, place it in a perforated plastic bag and inside the vegetable crisper.


These kitchen staples can last the longest when stored at around 60 to 65 degrees Fahrenheit. These should be okay to store inside a dark kitchen cabinet.

A whole bulb could last for months stored inside a paper bag in the fridge. However, all your other food items might taste like garlic if you store them with already cut ones. Once you refrigerate the garlic bulb, you should keep it inside until you are about to use it. Days after it has been taken out from the cold and into room temperature, it will start sprouting.

You should only store unopened bulbs inside the fridge and not sliced ones if you don’t want other food items to acquire a garlicky taste.


Carrots give off plenty of moisture, so you have to keep them dry if you intend to use it much later. This is because the moisture makes the carrots rot quicker. If they came in a plastic bag when you bought them from the grocery store, just put in a paper towel inside so it can absorb any moisture from the carrots. Once the paper towel gets saturated, replace it with a new one so you can keep your carrots fresh for up to a few months.


Onions can last up to a year as long as these are stored in a dry area with a temperature between 30 to 50 degrees Fahrenheit. If you don’t have the proper storage place, just keep it in mesh bags, like the ones used to pack onions sold by the grocery stores. If you store them inside a dark cabinet, they can last to a month or even longer.

Winter Radish

The white-colored daikon variety you see in your local grocery store is more pungent than the red ones you use for spring salads. So, if you’re looking for a healthy supply of fresh produce, don’t store too many of these. Storage for winter radishes is similar to that of carrots. After you remove the greens, place the radishes inside a plastic bag with a paper towel to absorb moisture. That way, these could last for about a month.

You can use shredded or thinly shaved winter radish for your slaw or salad.

Winter Squash

Varieties of winter squash, including pumpkins and butternut squash, can last around 2 to 6 months if stored inside a dark cabinet. Just make sure that you arrange them in a single layer so that air can circulate better. Stocking up on these versatile vegetables is a smart choice since these are packed with nutrients and can be used in a number of recipes.

Frozen Vegetables

Aside from your fresh produce, also hit the frozen foods aisle and stock up on a couple of packs of frozen vegetables. It may be healthier than fresh asparagus, spinach, peas, and other veggies with a short shelf life as these were frozen just hours after being harvested. Plus, you don’t have to worry too much about expiration as long as you keep it inside your freezer.

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