While I think cannabis is very bad, much worse than alcohol for the average person (see my comment above), and no one should even try it, I actually think it should be 100% legal. It’s insane and counter-productive to lock up hundreds of thousands of people just because they’re doing something stupid to their minds/bodies. If drug users are acting crazy and hurting people because of an addiction, then either prosecute them for real crimes they commit, or involuntarily commit them to treatment centers in extreme cases.
Another thing to consider: Some people want to use pot because they crave some kind of altered consciousness or experience. Some even want to experience spirituality through it. Don’t count on it. Jews have relied on prayer, meditation, fasting, and a little alcohol for these purposes. That’s all we need. If you’re interested in “expanding your consciousness,” rely on our historical methods, not drugs that can mess up your mind and give you mental health problems.