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First, people get into some alternate state if they don't panic, and realize some things. ("Bro weed made me realize universe and shit") They could habe realized all these thoughts if they were watching their own thinking patterns and tried to unlock them, but try telling this to a weedhead (this garbage thinking gets even stronger when it involves something like LSD ; "Bro I realized this" - "I knew that" - "No you could not" I had this actually happen to me, it's frustrating). So you go enjoy this state of mind for a while but it just dies down after, because, in fact, you realize that other person was still you and you are you even if you are high.
Some people use weed to bear with overwork, shit life, shit jobs, but that's even worse. I had a shit job and I smoked some weed for some time - the timing was right, I could smoke peacefully (I am quite paranoid myself), I had a good source and I bought in bulk so it wasn't that expensive either.
Using weed like this helps to smooth out the daily bothers, shithead coworkers, annoyances and gives you a little time to separate your mind from those and think (although this is extremely limited). The problem comes from how weed eats up all your time. It's not that hard to spend your time on weed, a little eating, smoking, watching some dumb shit, but in the end, you will never do anything, just default to weed as a low effort solution. So the cycle continues, and you will still have your shitty life with a shitty job, spending time doing jackshit and when you are sober, this will all come back on you, how you didn't progress with your life, so to chase away these bad feefees, you choose weed again. And so the cycle continues.
After you build up tolerance, and the initial 'different viewpoint' stuff wears off, weed will give you absolutely nothing, just a little buzz.
Luckily I gave up both weed and that crappy job too and I never missed it because I know exactly what it is. You probably read the line 'weed is for niggers' on the boards and that's 100% true. If you never had any talent, ambition, sense of mission, morals, you won't mind weed. But if you do, you will grow out of it pretty fast.