Teenagers
who smoke are more likely to die of heart disease decades down the line, even
if they quit by the time they’re middle-aged, researchers have found. Still,
the worst off were people who started smoking in adolescence and kept up the
habit their entire lives. They were twice as likely to die early as were
non-smokers, according to findings published in the Journal of the American
College of Cardiology. “The risks are cumulative,” said David Batty, who worked
on the new study at University College London. “If you smoke across a life
course, you’re at much higher risk than if you just smoked around the college
years,” he told Reuters Health. “The positive message is, it’s never too late
to stop.”
Past research has linked early smoking to
future heart disease and cancer. But those studies relied on middle-aged people
remembering if and how much they smoked when they were younger – which isn’t
always a reliable technique, researchers said. Instead, Batty and his
colleagues used data from an ongoing study of men who started college at
Harvard University in Cambridge, Massachusetts between 1916 and 1950 and
reported their cigarette use on school health exams. They were then sent
follow-up surveys related to smoking in the 1960s, ’70s and ’80s.
The new study included over 28,000 men, about
10,000 of whom reported smoking as undergrads. Almost half of the participants
died during an average follow-up of 53 years. Men who reported smoking on both
their college physical and follow-up questionnaires were twice as likely to die
as those who never smoked. In comparison, Harvard alums who smoked as teenagers
but then quit were at a 29-percent increased risk of early death. Risks were
higher for smoking-related cancers and heart disease, in particular.
“The good news is, for people who are able to
quit, this is going to have profound effects on their health,” said Dr. Michael
Siegel, a tobacco control researcher from the Boston University School of
Public Health. “For people who did quit smoking during the follow-up period,
their risk of death dropped greatly. It doesn’t quite go back to (non-smokers’
risk), but it is significantly less,” Siegel, who wasn’t involved in the new
research, told Reuters Health. But, he added, the study also “shows the
tremendous negative consequences if we don’t get people to quit.”
Siegel emphasized the importance of quit call
lines as well as anti-smoking media campaigns. “We can’t lose sight of all the
current smokers out there and the fact that smoking cessation rates are really
very low,” he said. About three percent of smokers quit every year, Siegel
said.
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