I don’t know man, I can only really speak for my experience.

I personally know of 2 people who have had bad experiences, and both of these were after several enlightening ones.

My theory at the time was that maybe they had outstayed their welcome in the DMT world, or maybe their behaviour or intentions there had been, in some way, disrespectful or unwanted.

Don’t get me wrong, I can definitely see how some people could be frightened, even by the experiences I had, if they were not accustomed to the idea of alternate dimensions, astral travel or ego-death.