What is the term for the smoke that rises from the lit end of a tobacco pipe?

• A. Mainstream smoke
• B. Sidestream smoke
• C. Secondhand smoke
• D. Thirdhand smoke

Answer: (B)

Smoke rising from the lit end of a burning pipe is sidestream smoke. It’s the portion produced directly by the burning tobacco as it combusts, entering the surrounding air without being inhaled by the smoker. Mainstream smoke is what the smoker inhales through the mouth and then exhales, while secondhand smoke is the overall exposure to others from both exhaled mainstream smoke and sidestream smoke. Thirdhand smoke refers to residues left on surfaces and dust after smoking. So the term for the smoke coming off the lit end is sidestream smoke.