is 20 cigarettes a day a heavy smoker What Cigarette Pack Year? Single cigarette takes 20 minutes
Single cigarette takes 20 minutes off life expectancy, study finds Smoking The Guardian Smoking more than 20 cigarettes a day may affect colour vision Charted: The Decline of Cigarette Smoking in U.S. Young Adults Give It Up: Cutting back helps, but even a cigarette or two a day carries risks
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