BTW, most use of marijuana is not for fun, but for intellectual or sensual stimulation, or religious/spiritual reasons, or for medical reasons. You are unfairly marginalizing and minimizing an experience you don't understand if you write all pot use off as fun. Also, consider the positive effects drugs have had in the lives of people like Carl Sagan, Steve Jobs, and Paul Erdos. If you are weighing the future, you should consider the opportunity costs of denying yourself access to the states of consciousness many visionaries bring their insights back from, as well as the negative.

I'm against letting the blind fear of irrational authorities stop people from meeting their human needs. Getting high is a human drive like sleep or sex. Do you think gay people should not have sex in places where it's illegal?

Would you say Turing shouldn't have had sex? Because he was ruining his future for the sake of some temporary fun that actually represented getting a psychological need met?