By: Dube, Shanta R., Felitti, Vincent J., Dong, Maxia, Chapman, Daniel P., Giles, Wayne H., and Robert F. Anda.
Using data from a clinic in California, these researchers find that an increase in the number of adverse childhood experiences, including parental separation or divorce, increases the likelihood of illicit drug use before age 14 by 2 to 4 times. Parental separation or divorce also increases the likelihood of using illicit drugs in adulthood.
Childhood abuse, neglect, and household dysfunction and the risk of illicit drug use: The adverse childhood experiences study. Pediatrics 111 (3): 564-72.