I started smoking it at.... 13-14 years old or something, and as time went on it was a case of this pattern developing:
# Wake up before school.
# Have a couple of buckets.
# Arrive at school.
# Have a spliff before classes started.
# Get through the first classes and go have another spliff.
# More classes then it's lunch, where a combination of spliffs, pipes and even bongs at one point (8( ) would be consumed.
# Last classes with another spliff at break.
# Go home and smoke buckets and spliffs until silly o'clock when I managed to get to sleep.
One day - many years later - Some mates and I planned on going to the pub, so first we had some stupidly potent spliffs and then pubbed it up. So we grabbed a drink and sat down underneath the TV that had some footy of some sort on it.
I started to get really paranoid (everyone's looking at me etc. etc.) so we swiftly downed our pints then went back to my mate's for more spliffs and nattering.
Then, all of a sudden and completely out of the blue, I started getting Psilocybin-esque visuals - Everyone's faces were morphing and dripping and all that.
I wondered if it was a trick of the light so I moved over to the other side of the room, but it was still happening.
Thought I'd lost it completely and gained a lovely disorder of HPPD and just tried to get used to it, which I did do eventually, and then at some point it stopped
And every time I smoke more than a couple of tokes then I become
so paranoid it's not funny

I can only handle a couple of tokes of a spliff and only if I am under the influence of Benzos, Booze and Opiates.
So, yes, that's it really.