Actually, I've been a stoner of a varying degree since I was 18. I wasn't even a smoke-err-day one until last year, where I probably got high at least one a day while working a minimum wage job for 8 months. Sometimes on the job.
I have mixed feelings about it, I support legalization, as with anything I don't think it's the thing itself that's the problem; it's people's usage and attitude toward it. But I did recently hear an NPR On Point bit where they discussed at length how it's generally considered a higher risk for young people under 25. The brain is going through a period of crucial development; it backed up a lot of what I had already read.
Even though I've experienced that even though there is a certain zen and open-mindedness weed can bring, and in a lot of ways it is less detrimental than alcohol, it can make depression worse in the long run, especially if you are going through withdrawal, and some low-grade psychosis, but that's inherent in its nature.
I have two schizophrenic relatives, the odds aren't high for me but rather be safe than sorry so I'm going easier on it for a few years. There are things I need to accomplish anyway and going dry is a challenge I need to give myself.
To add something else for consideration, it's a substance that heavily reinforces patterns, and I haven't really ruled out the possibility that since a lot of the time I was using it was accompanied with shitty attitude toward myself and interactions with women, that giving it a kick for awhile and building some new patterns might be an idea. Just some food for thought.