Lol that sounds awesome. I know I'm not nearly a heavy enough smoker to lay down a challenge, but I've got an idea for a side game you might consider adding. It's something me and my friends do every now and again when we're feeling slightly masochistic.

There are two versions;

1) Two people take simultaneous hits (my fav is for both to use bongs, but any piece will do fine) then drop and do ten pushups before releasing the air from their lungs. Repeat until one person drops out.

2) Two people take simultaneous hits, then drop and see you can do the most pushups.

Props for this whole thing dude... sounds awesome...