Children born to mothers who smoked during pregnancy are at increased risk for Tourette syndrome and other chronic tics, a new study suggests.
Tics are repeated twitches, movements or sounds that people are unable to control.
For the study, researchers analyzed data from more than 73,000 births in Denmark. The investigators found that children whose mothers smoked 10 or more cigarettes a day during pregnancy had a 66 percent increased risk of developing a chronic tic disorder.
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