数据显示，从1960年到2020年，在西方一些发达国家，与吸烟有关的疾病以及导致的死亡人数，诸如在美国，英国和加拿大等国，死亡人数是逐渐下降的。
与此同时，该项研究还表明，戒烟，特别是在40岁之前戒烟，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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