I have seen it play out both ways but that can be the case. It is a problem of over expectation and/or underestimation. If someone expects too much, he or she will be disappointed with anything that he or she gets. If, on the other hand, a person doesn't respect the power of the drug he or she is likely to take too much and get more than he or she bargained for. I have seen no addiction problems with psychedelics but people can come to think that they need anything.

This is not to say that a person can't seek enlightenment and find it though. It has worked for many people. The same is true of recreational use. Fun trips can be just that (though, I would argue that a night of fun can be enlightening experience too).