Source study (public): https://bmcmedicine.biomedcentral.com/articles/10.1186/s12916-015-0281-z https://bmcmedicine.biomedcentral.com/articles/10.1186/s1291...

Source study (public): https://bmcmedicine.biomedcentral.com/articles/10.1186/s12916-015-0281-z https://bmcmedicine.biomedcentral.com/articles/10.1186/s1291... Excerpts from the abstract: > In Australia, up to two-thirds of deaths in current smokers can be attributed to smoking. > Current smokers are estimated to die an average of 10 years earlier than non-smokers. > Among past smokers, mortality diminished gradually with increasing time since cessation and did not differ significantly from never-smokers in those quitting prior to age 45.