For the alcohol question, I'm actually very interested in seeing a stat of solitary drinking vs social drinking, and how it affects these statistics.

For instance I know parts of Europe still hold a very strong comraderie "pub culture." Alcohol is involved but so are strong social bonds.

The U.S has lately been making lots of quips about "wine moms" driven to sneak cheap chardonnay from the top cabinet, as well as the cliché portrayal of "working man who is so chewed up and burned out he needs a whisky and TV to sleep."

Not a fan of heavy drinking in general, but I hypothesize alcohol paired with isolation is much more likely to result in abuse and depression.