ASH Scotland
Working for a tobacco-free Scotland
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Second-hand smoke is a mixture of the smoke given off by the burning end of a cigarette, pipe, or cigar (sidestream smoke), and the smoke exhaled by smokers (exhaled mainstream smoke).
The ONLY way to completely reduce exposure to SHS is to smoke completely outside the home. Ventilation or smoking at the back door still leaves substantial amounts of smoke in the household air.