i think it mat be because you get bad dry mouth when you smoke and people don't think about the fact that you need to drink a lot of water when ever you do a lot of weed in one sitting. i would also recommend taking advil before you smoke that way your ready for the headache.i also recommend you stop for like 4 days if you can, you will be so fucked up if you wait that long, tahts what i do, i don't know about everyone else but i can't afford to smoke like ten bowls in one sitting so i wait til im able to get high off one or two bowls.that or just change your strain.