What percentage of smoke in a room comes from sidestream smoke?

Name: What percentage of smoke in a room comes from sidestream smoke?
Brand: Quizplus
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Question

Quizplus · Accepted Answer

85% of the smoke in a room can come from sidestream smoke, which is the smoke that comes directly from the burning end of a cigarette, cigar, or pipe, rather than the smoke exhaled by the smoker. This type of smoke can be a major source of air pollution indoors and contains higher concentrations of many toxic and carcinogenic substances compared to mainstream smoke.

What Percentage of Smoke in a Room Comes from Sidestream