Sorry for bumping this topic, but I don't agree with you. Dude a friend of mine smokes weed from 14th years, and he isn't getting smarter. He is 32 and works as a food runner. He lives from a paycheck to another. I asked him to come to study Programming with me, and he refused, I asked him to invest in BTC with me, I've got rejected. There is no way back for him, and he isn't getting smarter. You can increase your IQ only if you want to know something new, but when you are high, you can't even read properly a book. He got a chance this year to get a good job, and to be paid well, but he refused to pass the drug test.