My Boyfriend Occasionally Does Cocaine And Although I Am Completely

My boyfriend occasionally does cocaine and although I am completely against it, he says he will stop. He's mentioned and showed me tonsil stones and I've been researching trying to find if there is a direct collation between the two. Or because he is over weight and doesn't eat the best as well. Either way I want and need hard core evidence to prove to him that his drug habit is no good and I can prove to him that tonsil stones are one if the side effects. Can you help me please?