People may age “faster” if their father smoked during puberty, a study has suggested. The study, presented to the European Respiratory Society Congress in Amsterdam, found signs of faster biological ageing, compared with actual age, among people whose fathers began smoking at 15 or younger. The subjects were asked a series of questions including whether they or their parents had ever smoked and at what age. People whose fathers began smoking during puberty were around nine months to a year older than their chronological age on average. They found no clear pattern in biological ageing in people whose mothers smoked before pregnancy.