Dude I just keep em till I run out. I'm pretty flippant about my weed smoking and I buy a month's supply every month. If in the event that I run out the night before I buy my next months supply, I take all the roaches and smoke em in my waterpipe. When they're all gone I'll scrape the resin off and put it in a cigarette.

I haven't done this in a while so I've actually got about 1kg's worth of roaches at my house!!!!!! Which reminds me - how long does weed keep? I mean maybe I'm saving all my roaches and when I need em they'll be all crap!!