Something I found out that is very interesting to do is to rub your eyes for about 10 seconds and then put pressure on them for 15 seconds and let go. I've seen some crazy shit.

I also like showering after I smoke, not because of paranoia, just because I can feel the vibrations of the water and hear it. And I also try to remain mobile and not just sit my ass on the couch, because I will fall asleep.