Tips and advice on quitting and going clean?

I'm wanting to enlist in the army but I can't quite do that if I can't pass the drug tests. I only smoke weed. What are yalls tips on quitting sort of cold turkey and getting clean fast enough to say be enlisted in February of next year? I smoke disposables every day and have a good tolerance. I'm tired of being stuck in the piece of shit town I'm in and this seems like the quick and best way out.