I have sold oregano, for good reason though. A dorky friend of mine had wanted to see what weed was all about. He was only 14(I was 16) and I didn't think he needed to know what he was missing. He already had enough problems keeping up his grades. I only took $5 of the $20 he wanted to spend. He wasn't impressed by weed and didn't bother with it from then on.
I still believe what I did was right. He finished High school after all.