數據顯示，從1960年到2020年，在西方一些發達國家，與吸菸有關的疾病以及導致的死亡人數，諸如在美國，英國和加拿大等國，死亡人數是逐漸下降的。
與此同時，該項研究還表明，戒菸，特別是在40歲之前戒菸，可以大大降低死亡率。
Cessation, particularly before age 40 years, yields large reductions in mortality risk. Up to two-thirds of deaths among smokers are avoidable at non-smoking death rates, and former smokers have about only a quarter of the excess risk of death compared to current smokers. The gap between scientific and popular understanding of smoking hazards is surprisingly large.
The hazards of smoking and the benefits of cessation: a critical summation of the epidemiological evidence in high-income countries
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