Environmental Tobacco Smoke (ETS), also known as second-hand smoke, is the aged and diluted combination of the smoke rising from the lit end of a cigarette and the smoke exhaled by the smoker into the ambient air.

Public health authorities worldwide have concluded that ETS is a cause of smoking-related diseases in non-smokers. The public should be guided by the conclusions of those public health authorities regarding ETS.

Adults who smoke should show consideration and courtesy to other people and in particular should exercise care to avoid smoking around children.