I have a theory on why this, unforeseen sudden skitso depression paranoia experience comes from, and why it effects certain people and not others. I don't have time to get into it right now, but if I remember I'll bring it up later.
Something an uncle of mine, who grows, told me when I was 11 or 12 and I was messing with his plants;
"smoking pot is just a lazy mans way of passing the time"
it has always stuck with me. And its true. You have to deal with your shit, with life, everything as it requires your attention. If your to busy getting fuckin high/drunk/(insert your shitty distraction here) being a useless twat then life piles up, day after day, year after year, until you are so far behind, that somethings just cannot be remedied as their window of involvement has passed and the consequences of your decisions, or lack there of, now effect a permanent future. You will find (if your a decent person, with morels and standards) that you are no longer capable of pleasurable escape.
I know many who have never left the drug/pot/booze scene. It's just become such a part of their life that they don't even know what its like to be sober. Not saying their shitty people, in fact they can be really awesome people, but thing is they are so self medicated that the decisions they make are not clear. They find themselves going through deforces, losing access to their kids, their families, losing their houses, etc and they blow through it like without even seeing it. One day they will sober up, and be like holy fuck, what happened to my life, where did the people i loved go, who am i and what the fuck did i do...
live life. be sober for a months once and awhile. don't be that pot head stoner drunk loser.