Two weeks ago I stopped by a neighborhood corner store, where guys hang out outside most of the day everyday. Some very small smalltalk was made as I was walking in ("hellos") and on the way out one guy pulled me aside and offered me some "white".

Last night, as I was about to pay and walk out of another similar corner store, a young man leaned inside to say it was his birthday and asked if I'd buy him a $1 ice cream sandwich. Prolly not his birthday, but I bought it. As I'm standing outside for about 2 minutes before we leave (me, a man, with three women friends) he thanks me for the ice cream, then asks me if I want some crystal. I don't. He asks again 1 minute later. I still don't. He asks if I have any friends who might want it. Nope. I wished him a happy birthday again and we crossed the street. 5 minutes later he catches up to us and asks me again.

OKP: how do you politely but effectively decline the drugs?