In college I drank the cheapest beer available, including generic beer. In cans. I can also recall several times when I drunkenly picked up someone else's drink at a party, took a swig, and realized they had been using it as an ashtray. (I didn't know about the ciggies though, so zxcirce has me beat.)
As the years unfurled, I moved to more upscale drinks. Nice microbrews, fine wine. And I started to drink alone, so no risk of encountering discarded cigarette butts. But I was 40, not 20, and I had a kid to think about. So I would say those pricey drinks were, in their own way, worse than the warm, ash-filled cans of beer.