(US NEWS) – Children whose mothers use marijuana are likely to begin using the drug earlier than children whose mothers do not, according to new research.

A study published Monday in the American Journal of Preventive Medicine says children of women who consume marijuana use the drug themselves an average of two years earlier than children of women who do not use the drug.

Researchers from the Harvard T.H. Chan School of Public Health analyzed data from the National Longitudinal Survey of Youth 1979 and Child and Young Adults. They examined marijuana use among 4,440 children and 2,586 mothers and observed when participants began using the drug. Researchers tested for the effect of a woman’s pot use between her child’s birth and age 12 on the child’s subsequent risk of using the drug themselves.

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