A large study published in PLOS Medicine has taken a fresh look at how smoking intensity and the timing of quitting relate to long-term cardiovascular health.
According to the researchers behind the analysis, which drew on data from 22 population cohorts, tobacco remains one of the leading contributors to preventable disease and premature death worldwide.
Although public health campaigns have emphasized the benefits of giving up cigarettes entirely, many smokers try instead to cut back.
That trend has left an important question unresolved: how much harm is caused by those who smoke only occasionally or limit themselves to a few cigarettes a day?
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Patterns across hundreds of thousands of adults
The combined studies followed more than 323,000 adults for up to two decades, tracking self-reported smoking habits alongside outcomes such as heart attacks, strokes, atrial fibrillation, heart failure, and overall mortality.
Across the board, people who continued smoking faced higher risks than those who never smoked.
Men in the study had roughly a three-quarters higher risk of cardiovascular disease if they smoked, while women faced more than double the risk, according to the research team.
Even at very low levels, one to five cigarettes per day, the likelihood of heart-related complications increased.
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The danger rose sharply with additional pack-years, especially during the first decades of use.
Quitting brings rapid and lasting benefits
One of the clearest findings involved cessation. The steepest drop in risk appeared within the first 10 years after quitting, and the improvement continued well into the second decade.
By about 20 years after stopping, former smokers had dramatically lower risks than those who continued to smoke.
Researchers emphasised that reducing cigarette use offers far less protection than quitting altogether.
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Their conclusion was straightforward: even light smoking can strain the heart, but stopping, at any age, delivers meaningful benefits that grow over time.
Sources: News Medical, PLOS Medicine