second-hand smoke
noun [ U ] uk/ˌsek.ənd.hænd ˈsməʊk/ us/ˌsek.ənd.hænd ˈsmoʊk/
二手烟
unwanted smoke that people breathe in from cigarettes, etc. that other people are smoking
Many children suffer from the effects of second-hand smoke. 许多小孩受二手烟之害。
See also: passive smoking