MICROANATOMY

Detailed explanation-1: -Mainstream smoke: The smoke exhaled by a person who smokes. Sidestream smoke: Smoke from the lighted end of a cigarette, pipe, or cigar, or tobacco burning in a hookah. This type of smoke has higher concentrations of nicotine and cancer-causing agents (carcinogens) than mainstream smoke.

Detailed explanation-2: -Secondhand smoke refers to the ambient smoke that is a by-product of active smoking. It consists mainly of exhaled mainstream smoke and sidestream smoke mixed with air. In addition small amounts of mainstream smoke also escape through the cigarette mouthpiece, and vapour compounds diffuse through the cigarette wrapper.

Detailed explanation-3: -• Secondhand smoke is composed of sidestream smoke (the smoke released from the burning end of a cigarette) and exhaled mainstream smoke (the smoke exhaled by the smoker).