Also, I am PRETTY sure 'how many times you took acid' is part of the equation too. After you've seen houses melt two or three hundred times, bong hits can trigger after shocks in my opinion.
This is a great point actually, the first time I had terrible anxiety from smoking pot was after having tripped for the first time. LSD does open you up and make you far more sensitive to some of the ill effects of some certain types of herb.
+k dude