However the authors write that they cannot rule out the possibility that the factors that predispose people to use cannabis early also put them at risk for common mental disorders.

“These common factors might include biological, personality, social and environmental factors, or a combination of these factors. This is a plausible hypothesis because social disadvantage is more common among persons who are problematic substance users and who meet criteria for common mental disorders,” they write.

Hmmmmmmmmmmm