I think this one is going to be difficult to study, as often alcohol use is correlated to mental health issues - people self-medicate with alcohol in order to c

I think this one is going to be difficult to study, as often alcohol use is correlated to mental health issues - people self-medicate with alcohol in order to cope with their problems. There are also surely people who start drinking too much and then develop problems as a result, so it's a fairly classic correlation vs causation problem.