I've spent months in my mind (chemical coma), the knowledge I've gained there I can compare to no other. Years later I am still working through the massive amount of data and introspective knowledge I gained. I was happy Inception was created because suddenly the vox pop can grasp some part of what it means when I say I've known many lifetimes, many courses of the universe, the ebb and flow of time. This thought thread is a book onto itself, getting into it now is like licking an iceberg worrying about getting my tongue stuck.
Looking at the connections to ...
Honestly, having the ability to access any piece of knowledge as long as I know how to find it has revolutionized my life. I would for years get hung up in my own mind when I was missing a key fact in a discussion or debate, now I find I can more eloquently present myself while essentially throwing links at the other person (rarely in real time and if in real time usually just as an exercise in my own mind). As someone with a short attention span my ability to pull hard data from my active memory has always been difficult. But now, what was a hindrance, is...
You can have level 5 trips from THC, you just need enough of it. See http://www.erowid.org/psychoactives/faqs/psychedelic_experience_faq.shtml