A member asked:

Is it true that inhalation of second hand smoke is equal to how many inhalations of first hand smoke?

A doctor has provided 1 answer
Dr. John Chiu answered

No definite answer: It all depends on how closely you are situated to the smokers and the amount of smoke in the air in second-hand smoke. In first-hand smoke it will also be dependent on how deeply you inhale the smoke. In general, i would assume that you are getting more from 1st-hand than 2nd hand smoke. Interesting question but no definite answer.

Answered 9/28/2016

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