Cloud of small particles and gases that is given off from the end of a burning tobacco product (cigarette, pipe, cigar) between puffs and is not directly inhaled by the smoker; the smoke that gives rise to passive inhalation on the part of bystanders. SN secondhand smoke. RT mainstream smoke.

Smoke that comes from a lit or smoldering cigarette (in contrast to "mainstream smoke" that is exhaled by a smoker).

smoke that is emitted from the burning tobacco but is not inhaled by the smoker.