When I prepare to do something different, even risky, like smoking pot, I'm starting to think that God doesn't want me to do that and therefore he'll do something to stop me. First time I noticed these thoughts was a few years ago when, as a 14 year old, I'd pick up half-smoked cigarettes from the street and smoke them myself (stupid, yeah). I can't remember what exactly triggered those thoughts (if there was any trigger), but ever since I've been much worried than before.