Noun
passive smoking (uncountable)
The inhalation of tobacco smoke by a non-smoker due to proximity to smokers.
Passive smoking causes about 3,400 deaths from lung cancer each year in the USA. Source: Internet
Passive smoking is also associated with increased risk, but to a lesser extent. Source: Internet
Passive smoking —the inhalation of smoke from another's smoking—is a cause of lung cancer in nonsmokers. Source: Internet