| smoke from a cigarette, cigar, or pipe that is involuntarily inhaled, esp. by nonsmokers. |

| secondhand smoke n. Cigarette, cigar, or pipe smoke that is inhaled unintentionally by nonsmokers. |
secondhand smoke sec·ond·hand smoke (sěk'ənd-hānd')
n.
Cigarette, cigar, or pipe smoke that is inhaled unintentionally by nonsmokers and may be injurious to their health if inhaled regularly over a long period.