i only smoke cigarettes at night Single cigarette takes 20 minutes off life expectancy, study finds What methods can we use
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N.Sandoval-SnchezA.Milln-MejaP.Snchez-CastilloH.et al

Meta-analysis results reveal that people who smoke only a few cigarettes per day still face much higher rates of cardiovascular problems compared to non-smokers
USA 110 , 1957919584 (2013)

It differs from asthma, as asthma occurs in attacks, while COPD is progressive