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Neither are people who never smoked, even though they account for 10% to 20% of U.S

Key points: Large study consolidates previous evidence of link between smoking and changes in DNA Mothers of 13 per cent of 6,000 babies in study smoked regularly These babies had changes in DNA in over 6,000 places, about half these locations involved a single gene Doctors have long warned women to avoid cigarettes while pregnant because smoking can lead to stillbirth or babies born with cleft palate, lung disease, or neurobehavioural problems

Because scent connects strongly to memory and emotion, this experience often feels deeply personal

The new rules on public consumption come as a breath of fresh air to health advocates and others turned off by second-hand smoke

Smoking tobacco is what causes cancer, but experts say highly addictive nicotine is still harmful to human health