Quit a few threads like this already
But I would do is look for existing threads or subforums or search for users in the same area as you.
Also, I find people by simply smoking outside and someone will make conversation with me. Or on Monday I asked one guy for a lighter and he siad 'Is that a zoot?' and the next minute he is going to offer me number. Then 20 minutes later I went to my lecture and sat next to a guy I never met before and we had a giggle, I said 'Sorry,I'm kinda high right now.' and he said 'So am I' without skipping a beat. He then took me to the local 'stoner area' I knew nothing about (I just smoke outside the door of wherever) and then all of a sudden dealer shows up offering half my usual prices and his friend with yet more connections.
I know at first you'll be thinking how on earth are you going to find people to smoke with; I felt the exact same way my first week at Uni until I went looking for place to smoke and stumbled upon a circle and just knew I'd found the potheads. Look for circles of people smoking, or watch cigarette smokers who appear to be toking it like a joint. I've noticed it's a habit of stoners who also smoke tobacco to treat a cig like a joint at times. Watch someone's reaction asking to borrow a king sized rolling paper.
I meet new stoners every week. Sometimes I spot someone with a pot leaf earring or lighter, or they watch me buying king sized rolling papers, or follow my intuition guessing the right sort of people to spark up sitting next to at the bus stop. Every single time the person has turned around and said 'Nice.... what you smoking?'
So yeah, at first I thought it'd be me me out smoking in the cold by mysef between classes but all the stoners seemed to appear at once. Just keep a look out and don't get in trouble lol.
But yeah, I'd trust most of the people here (most). After all I keep saying, this site is how I met my awesome stoner boyfriend. Had I not ignored the paranoia/self-preservation over the internet instinct, I woud never have given him my number or jumped on a bus to the other side of the country and met a really cool person.
There is another recent thread on meeting other members of this site in general called 'RIU' friends. The other 'stoner buddies' or 'can you tell?' sort of threads give tips on spotting '420-friendly' people.