That's about a decade before he was diagnosed with glioblastoma. It wouldn't be surprising if he already had an astrocytoma at that point, but was unaware of t

That's about a decade before he was diagnosed with glioblastoma. It wouldn't be surprising if he already had an astrocytoma at that point, but was unaware of the subtle effects which his brain was beginning to compensate for. That's the bitch about a brain tumor. Your mind is really good at working around it, until it isn't, and then you can't see straight or some other symptom which appears suddenly. I don't mean to completely diminish your point. Psychedelics can hit you in unpredictable ways, even when you have experience.