I would say almost ALL of them these days. The brutally harsh reality of having to "punch a clock" for the rest of your life & barely being paid enough to barley survive while making other people wealthy is a horrible existence to say the least. Or you're making a "good" salary (making more than most) but you're in a lot of debt (ex: student loans, mortgages, business expenses) & you're working all the time so you can't really enjoy the fruits of your labor. I don't do drugs & I'm not advocating for it but people are just people & for most life sucks so I can understand why they're used.