Yeah, that'd be a pretty dick move on your part.

What happens when these leaves don't get the kids high? That means they won't buy from you anymore, they'll tell their friends not to go to you.. and that means you'll be shit out of luck eventually. And you never know what people will do if you fuck them over like that... that's why dealing is such a risk.

Don't do it unless you're prepared to handle the possibly bad consequences.