Speaking from experience and observation, doing it multiple times a week does dull the brain and doing it most nights a week does make you generally more paranoid, even if it doesn’t push you over the edge.

I tend to do it in phases. I’m a stoner for a month or two and then later just occasionally.

The best rule for drugs and alcohol is: if you’re doing it to make a fun time more fun, then it’s probably fine. But if you’re doing it to try and make a bad time better, you shouldn’t do it.

There’s nothing wrong with smoking a joint to take the edge off. But if you need to smoke a joint to take the edge off then you’ve formed a dependency.