Buster33 repeats the mantra of the potheads: the law doesn't work. Not true. I personally know people who got mixed up with marijuana. They would have become even more entangled with marijuana and other drugs if it were not for the fact that these drugs are illegal. Ultimately they managed to get free of drugs altogether. So, yes, prohibiting drugs does deter drug use. Only someone whose mind is rotted out by marijuana would think otherwise.