Weed friend

Friend(s) that only hang out with you to split the bill on the cannabis your buying. Then they leave after buying or smoking.
A weed friend is not a real friend, more an associate, and probably cares little about you. If it's not on the topic of money or drugs he won't be interested in anything you have to say.
Try to find better friends.

Ex: My weed friend, Oscar, only hangs out with me if I have 5 down on it.