How Your Genes Influence Your Weed Habits

We're still just beginning to understand why some people become dependent on marijuana but others don't. Your genes could have a lot to do with it, a new study suggests.

For the first part of the study, published online today in the Journal of Abnormal Psychology, researchers looked at genetic data from 1,558 Australians who reported both marijuana use and childhood sexual abuse. 

From that data, the researchers found an association between certain variations in participants' DNA and the likelihood that those participants would become dependent on marijuana: Cannabis dependence and childhood trauma were linked only for those participants who had this specific variation, even though everyone in the study used cannabis to some degree. 

We already know that childhood trauma — like sexual assault — is associated with a much higher risk of becoming dependent on a variety of substances, including alcohol and marijuana. But many people who have traumatic backgrounds...

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