It's all a bunch of bullshit. I've been smoking for nearly 25 years and have suffered none of the so-called "long-term effects" of marijuana use. Nobody who isn't very close to me an/or a smoker themselves would have any clue that I'm a marijuana smoker. If your teacher lived next door to me she would be more inclined to nominate me as the president of the local D.A.R.E chapter than to think I actually used the demon weed. She might, however, wonder what that funny smell is every now and then