Tobacco and myocardial infarction: Is snuff less dangerous than cigarettes?

Abstract

Objective - To estimate the risk of myocardial infarction in snuff users, cigarette smokers, and nontobacco users in northern Sweden, where using snuff is traditional. Design - Case-control study. Setting - Northern Sweden. Subjects - All 35-64 year old men who had had a first myocardial infarction and a population based sample of 35-64 year old men who had not had an infarction in the same geographical area. Main outcome measure - Tobacco consumption (regular snuff dipping, regular cigarette smoking, non-tobacco use) and risk of acute myocardial infarction. Results - 59 of 585 (10%) patients who had a first myocardial infarction and 87 of 589 (15%) randomly selected men without myocardial infarction were non-smokers who used snuff daily. The age adjusted odds ratio for myocardial infarction was 0.89 (95% confidence interval 0.62 to 1.29) for exposure to snuff and 1.87 (1.40 to 2.48) for cigarette smoking compared with non-tobacco users, showing an increased risk in smokers but not in snuff dippers. Regular cigarette smokers had a significantly higher risk of myocardial infarction than regular snuff dippers (age adjusted odds ratio 2.09; 1.39 to 3.15). Smoking, but not snuff dipping, predicted myocardial infarction in a multiple logistic regression model that included age and level of education. Conclusions - In middle aged men snuff dipping is associated with a lower risk of myocardial infarction than cigarette smoking.