A large study exploring possible genetic influences on cannabis use disorder has identified two regions in our DNA — one newly identified and a second that replicates a past finding — that appear to contribute to one’s risk of becoming dependent on marijuana. The researchers analyzed DNA and other data from almost 21,000 people diagnosed with cannabis use disorder and another 360,000 who did not have that diagnosis. They found an association with cannabis use disorder in a region of DNA near the FOXP2 gene on chromosome 7, a gene previously linked to language development and to risk-taking behavior. [...]