A member asked:

Which is worse exposure to second hand cigarette smoke or exposure to auto exhaust?

A doctor has provided 1 answer

Nothing to choose: Both are bad in different ways. Tobacco smoke predisposes to heart attacks, aggravates respiratory problems and may marginally increase the risk of cancers. Auto exhaust causes respiratory damage, carbon monoxide poisoning and depending on the type of exhaust may increase the risk of cancers.

Answered 6/23/2012

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