From Science Daily: A Norwegian study shows that asthma is three times more common in those who had a father who smoked in adolescence than offspring who didn't.
It is well known that a mother's environment plays a key role in child health. However, recent research, including more than 24,000 offspring, suggests that this may also be true for fathers.
"Offspring with a father who smoked only prior to conception had over three times more early-onset asthma than those whose father had never smoked," says Professor Cecilie Svanes at the Centre for International Health, Department of Global Public Health and Primary Care, University of Bergen (UiB).
Early debut increases risk
The study shows that both a father's early smoking debut and a father's longer smoking duration before conception increased non-allergic early-onset asthma in offspring. This is equally true with mutual adjustment, and adjusting for the number of cigarettes smoked and years since quitting smoking.
"The greatest increased risk for their children having asthma was found for fathers having their smoking debut before age 15. Interestingly, time of quitting before conception was not independently associated with offspring asthma," Svanes says.