Its also possible, however, that they underestimated cancer deaths tied to smoking because they didnt have data on second-hand smoke exposure, which may cause an additional 5 percent of lung cancer deaths, or on use of cigars, pipes, or smokeless tobacco
Dozens of lighters participated in this study and although not very scientific, it is the result of much empirical observation and is not offered as absolute fact.
If a person died of a respiratory disease at age 70 years then their years of life lost due to smoking would be five years (75-70) multiplied by the smoking attributable fraction for respiratory disease (around 37% or 0.37) giving a contribution of 1.85 years to the years of life lost due to smoking calculation, and if another person died of respiratory disease at age 80 years their contribution would be zero (no years contributed above the age of 75 years)
It also detected nicotine in products labeled as nicotine free
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