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A 41-year-old member asked:

can you let me know how many times do we have to inhale second hand smoke to equal one cigarette?

1 doctor answer1 doctor weighed in
Dr. Ronald Krauser
A Verified Doctoranswered
A US doctor answeredLearn more
It depends: It depends on the degree of exposure. If multiple people are smoking in a small room, the second smoke exposure will be significantly greater than a single person smoking in a large, well ventilated room.

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A 36-year-old member asked:

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

1 doctor answer1 doctor weighed in
Dr. John Chiu
Allergy and Immunology 57 years experience
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.

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Last updated Sep 29, 2016

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