Question

Smoke exhaled from a smoker’s lungs is called mainstream smoke.

Answer 1

Actually, the smoke exhaled from a smoker’s lungs is referred to as "exhaled mainstream smoke." Mainstream smoke is the smoke that a smoker inhales and then exhales, while "sidestream smoke" is the smoke that comes directly from the burning tobacco product itself, such as a cigarette or cigar. Both types of smoke contain harmful chemicals and carcinogens, but they can differ in their composition and concentration.