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Mainstream Smoke


Updated March 29, 2013

Written or reviewed by a board-certified physician. See About.com's Medical Review Board.

Mainstream Smoke

Mainstream smoke is residual cigarette smoke exhaled by smokers.

Photo © Stockxpert
Mainstream smoke is the exhaled smoke released after taking a puff on a lit cigarette.

The composition of mainstream smoke is affected by how the smoker inhales and exhales, so it will vary from person to person. The frequency of puffs, duration and volume all contribute to the chemical makeup of mainstream smoke.

See Also:
Secondhand Smoke Facts

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