Im in America, but this shouldn't make a difference.

I mean, first find people who smoke. You can make subtle inferences if you don't feel comfortable. Almost everyone does it. Just don't ask a cop. Anyway, ask them if they want to smoke and if you can throw down if they only have a little bit. I mean, it takes time, but they way to find a dealer is to find people who smoke first.

Good luck, hope the best for you.