There are debatable benefits to this, such as learning to cope with anxiety (although in a "forced fashion"... not too healthy IMO) but I think the trivial good is outweighed by the fact that you're inducing states of fear and unmanageability. Fear and anxiety cause stress in the body, cortisol production increases and you would likely suffer long-term physiological consequences from your body being in a state of physiological agitation. I can't speculate on what "damage" (phrase it however you'd like!) you might be, or not be, doing to yourself psychologically; as was stated before, you know yourself better than we do.
My suggestion is to make every effort to stop using the drugs that cause paranoia and anxiety. It may even be wise to shoot for abstinence from drugs entirely, and if you took this route I can almost guarantee you that you'd be astounded by what becomes visible to a person about themselves that has been affected (to some degree) by using drugs. Routinely manipulating one's natural brain chemistry. Done it a thousand times, can't come up with a reason to recommend it to any one!
~ Vaya