Question

smoke that comes off of the burning end of a pipe or cigar is known as ___.
○ mainstream smoke
○ upstream smoke
○ sidestream smoke
○ bottomstream smoke

Explanation:

Smoke that comes off the burning end of a pipe or cigar is known as sidestream smoke. Mainstream smoke is inhaled by the smoker and exhaled. There is no such thing as upstream or bottom - stream smoke in this context.

Answer:

C. sidestream smoke