Because of asshats that advertise it like if it was healthy for you, people lacking the ability to use drugs in moderation, because of assholes that go to work under the influence and make it a living hell to get proper service, because of people making high claims of saying "it doesn't affect my driving, if anything I suddenly become a nascar driver", those people that insist everybody knows they do it, those pricks who managed to convince my 13 year old cousin that he should try it, for those dumbasses who actually have the decency to say that marijuana can cure cancer ( reason cancer is so hard to fight is because it's not any sort of infection or virus, it's literally your cells incorrectly replicating and leaving strands of incorrect data to keep being replicated. Due to this happening the only wait to fight is is to literally kill off cells, hence being shot up with chemotherapy. I will admit, it's helpful in easing the pain and some symptoms related to therapy. But there is not substantial evidence to make such a statement as the prior.) those assholes who are willing to walk around with their cloths saturated in the smell of weed(you're just as bad as those asshats who smell of cigarettes), those who get offended when you tell them not to do that shit around you and then blow the smoke right at you (I work at a hospital and if any of that shit has any chance of showing up I'm out of a job and will probably never get a job in the health field again), to those inconsiderate dicks who would even dare smoke in front of kids. These are the social aspects of why I can't support marijuana. I'd say other reasons, but I know how the potheads could get on these forums. To the 15% of you who are functioning adults who don't do any of this stupid shit, all the more power to you. But the majority of the crowd fûcks it up for you.