None if really "few": There are people who can "socially" some tobacco, with one or two cigarettes per week, but in my experience they are few and far between. The danger to your health from that level of smoke is not that high, but it is probably measurable, and may be similar to the risks that second-hand smoke causes. I always advise people not to take the chance and stay away from tobacco 100%.
Answered 3/5/2014
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