I believe you have a bad goal in mind to begin with. You shouldn't go out with intentions of meeting druggie friends. Sure you need a hook, but what you really should search for is regular friends who smoke some green on the side. Ask and you shall recieve. If you ask for druggie friends, you'll get druggie friends. Every clique has somebody who smokes weed. Just gotta meet 'em.

Go to the regular places people meet people. People know people. Casually mention smoking pot to somebody (after assessing their coolness). See if they wanna ride around the block and burn one after the bar closes or show lets out. Exchange numbers. Do whatcha gotta do.

It depends on how old you are too. If you're young, look for the kids that smoke in the bathrooms at school. They usually smoke pot too. Hang with them after school. If you're old/whatever enough to drink, invite a couple folks over for a night cap. If they seem cool, break out a joint. Or do the after bar ride thing.

Anyhoo, I'm no expert and that's about all I feel like typing right now. I wish you luck.