orange peel works fine, just dont leave it in with your weed for a long time you dont have to use the entire orange peel either - just a small piece maybe the size of two quarters
orange/lemon/lime/grapefruit peels will all work fine. leaves would work too, but are a lot harder to find...the citrus adds a fresher smell (not so much anythin on the taste side) it seriously doesn't cause mold as long as you aren't a dumbass about it and leave it there for a week
lol i guess, but the potheads i know don't let nasty shit grow in their weed just put the open sack in like a tupperware, put a bit of orange peel in there with it. put the whole thing like in your desk drawer, go to sleep, wake up - open the drawer and take out the peel. it could be a little too moist at first, so you might want to let the sack air out for another hour or so