Smoke that passes from a cigarette into the surrounding air, rather than into the smoker's lungs.
侧流烟（指从香烟飘到空中而未吸入肺里的烟）
asthmatics experience a significant decline in lung function when exposed to sidestream smoke
Example sentencesExamples
Second-hand or passive smoke exposure occurs when nonsmokers breathe the sidestream smoke created in indoor environments from the presence of smokers.
The sidestream smoke that others breathe in is actually more dangerous than the mainstream smoke that smokers inhale directly from a cigarette.
Ventilation systems certainly do work in terms of removing the irritants in cigarette smoke, but they do not remove the carcinogens in sidestream smoke.
Many potentially toxic gases are present in higher concentrations in sidestream smoke than in mainstream smoke and nearly 85 per cent of the smoke in a room results from sidestream smoke.
There is no ventilation system that reduces or eliminates the carcinogenic products of second-hand smoke or the sidestream smoke from cigarette smoking.
Definition of sidestream smoke in US English:
sidestream smoke
nounˈsīdˌstrēm ˌsmōk
Smoke that passes from a cigarette into the surrounding air, rather than into the smoker's lungs.
侧流烟（指从香烟飘到空中而未吸入肺里的烟）
asthmatics experience a significant decline in lung function when exposed to sidestream smoke
Example sentencesExamples
There is no ventilation system that reduces or eliminates the carcinogenic products of second-hand smoke or the sidestream smoke from cigarette smoking.
Many potentially toxic gases are present in higher concentrations in sidestream smoke than in mainstream smoke and nearly 85 per cent of the smoke in a room results from sidestream smoke.
The sidestream smoke that others breathe in is actually more dangerous than the mainstream smoke that smokers inhale directly from a cigarette.
Second-hand or passive smoke exposure occurs when nonsmokers breathe the sidestream smoke created in indoor environments from the presence of smokers.
Ventilation systems certainly do work in terms of removing the irritants in cigarette smoke, but they do not remove the carcinogens in sidestream smoke.