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Abstract
We used individual level data from the UK Biobank in a Mendelian randomisation framework to study the association between smoking intensity and specific causes of mortality. This data was meta-analysed with the Norwegian HUNT2 study. We found evidence to suggest that each effect allele of the rs1051730 (a genetic variant associated with smoking intensity) was associated with a 9% increased hazard of all-cause mortality (95% confidence interval 6-11%) among ever smokers. Effect alleles were also associated with death by neoplasms (HR 1.11, 95% CI 1.06-1.15), circulatory diseases (HR 1.06, 95% CI 1.01-1.11), and respiratory diseases (HR 1.15, 95% CI 1.05-1.26) among ever smokers.