Lingering residue from tobacco smoke which clings to upholstery, clothing and the skin releases cancer-causing agents, work in PNAS journal shows.
Berkeley scientists in the US ran lab tests and found "substantial levels" of toxins on smoke-exposed material.
They say while banishing smokers to outdoors cuts second-hand smoke, residues will follow them back inside and this "third-hand smoke" may harm.
Opponents called it a laughable term designed to frighten people unduly.
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