Heart Disease, Stroke Risk Up Even Smoking 1 Cigarette/Day

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Heart Disease, Stroke Risk Up Even Smoking 1 Cigarette/Day
Heart Disease, Stroke Risk Up Even Smoking 1 Cigarette/Day

THURSDAY, Jan. 25, 2018 (HealthDay News) -- Smoking one cigarette per day is still associated with a significant increased risk of coronary heart disease and stroke, according to research published online Jan. 24 in The BMJ.

Allan Hackshaw, Ph.D., from Cancer Research UK in London, and colleagues quantified the risk of coronary heart disease and stroke associated with light smoking. The relative risks were pooled in a meta-analysis; 55 publications with 141 cohort studies were included in the meta-analysis.

The researchers found that the pooled relative risk for coronary heart disease was 1.48 and 2.04, respectively, for smoking one and 20 cigarettes per day for men, using all studies, and 1.74 and 2.27, respectively, in studies in which the relative risk was adjusted for multiple confounding variables. For women, the corresponding relative risks were 1.57 and 2.84 for one and 20 cigarettes per day, and 2.19 and 3.95, respectively, after multivariable adjustment. Men and women who smoked one cigarette per day had 46 and 31 percent, respectively, of the excess relative risk of smoking 20 cigarettes per day (53 and 38 percent, respectively, using relative risks adjusted for multiple variables). For stroke, the excess risk associated with one versus 20 cigarettes per day was 41 and 34 percent for men and women, respectively (64 and 36 percent, respectively, using relative risks adjusted for multiple variables).

"Smoking only about one cigarette per day carries a risk of developing coronary heart disease and stroke much greater than expected," the authors write.

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