Cigarettes: The lung cancer risks
In April 2005, ex-smokers were reminded that the habit they kicked
may come back to haunt them. The newscaster Peter Jennings announced
that he has lung cancer, even though he quit smoking 20 years ago (except
for a brief relapse after the September 11, 2001, terrorist attacks).
Smokers who quit are rewarded quickly when it comes to heart disease.
Within a year, their risk drops to half that of active smokers. After
15 years, it approaches that of people who’ve never smoked at all.
This is great news because the risk of dying young from heart disease
is so much greater than it is from cancer, for smokers and nonsmokers
Now for the bad news. As perhaps evidenced by Jennings, the lung cancer
risk from smoking fades more slowly than it does for cardiovascular disease,
perhaps because of lasting DNA damage to lung cells. Even 10–15
years after quitting, several studies have shown that an ex-smoker is
several times more likely to die of lung cancer than someone who has
never smoked. A study published in early 2005 found that former smokers
are also more vulnerable to the effects of secondhand smoke in the workplace,
even if they haven’t lit up for the last 10 years.
Does the lung cancer risk ever go away? That may depend partly on how
old you are when you quit. A study in the April 2005 Annals of Epidemiology reported
that women who quit before age 30 are no more likely to die from lung
cancer than their counterparts who never smoked. British and Japanese
researchers have also reported an earlier-the-better age effect. On the
other hand, a study of American veterans started in the 1950s showed
that even 40 years later, former smokers had a 50% greater chance of
dying from lung cancer compared with lifetime nonsmokers.
Still, here’s an area where quitters prosper: Even people who
shake the smoking habit in their 60s substantially reduce their lung
cancer risk — and add several years to their life expectancy.
September 2005 Update
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