Some wrong data here. For one thing you seem to be implying "2 to 5% of drug users go on to develop DP/DR", which is definitely not correct. 2% is about the
total lifetime prevalence for depersonalization in
all Americans (
source); since trauma, war and sexual assault account for some significant percentage of this, the amount caused by drugs is much lower, and cannabis is just a fraction of that. Also, the paper (which is about cannabis-induced DP specifically) states
So, people who have severe problems tend to:
* have an existing anxiety disorder
* start use young
* even among these people, most recover within hours, and it's a subgroup of people who have more long term problems.
Granted, that I agree with the general sentiment that people in anxious states and/or below the age of 24-25 shouldn't mess with weed. Happy to discuss this more over in one of the cannabis threads; this is not really the place and I regret the derail.
I'd say it bothered me for a year or two. Not sure I "got rid of it" as much as various experiences of meditation, dreams, etc convinced me that all of perceptual reality is pretty subjective and malleable, and therefore it's not worth spending energy getting distressed about the nature of my ontology; these things simply are.