If you buy illegal drugs in a country with a government like Thailand's, you're asking for a bad time. I've spent over 5 months around TH with no problems at all, as have many of my friends. On top of that, Phuket is a terrible cesspool of scammers and partying tourists and should be avoided at all costs. Try a nearby smaller town if you're going for the nature. He gets no sympathy from me, but thanks for the story.