what happens if you smoke a lot of cigarettes Tobacco Ages — Even You Don't Smoke Benefits of quitting tobacco –

[In 1982] this Department issued a report in which it was estimated that tobacco use, particularly cigarette smoking, was related to 30 percent of all cancer deaths in the United States-a projected 129,000 premature deaths

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The study included 20 participants, all dependent smokers, who each smoked a cigarette prior to the study's commencement and were told they were unable to smoke for the rest of the time

Washington, DC: National Academies Press, 2018

[31] Nearly all Chinese physicians (95%) believed that active smoking causes lung cancer and most believed that passive smoking causes lung cancer (89%), but current smokers were less likely to hold these health beliefs than nonsmokers were