Smoking outside (and away from other family members) is better than smoking indoors but nicotine residues will stick to a smoker's skin and clothing. Those residues follow a smoker back inside and get spread everywhere. The biggest risk is to young children. Dermal uptake of the nicotine through a child's skin is likely to occur when the smoker returns and if nitrous acid is in the air, which it usually is, then TSNAs (carcinogenic tobacco-specific nitrosamines) will be formed.
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