Raw marijuana,has natural irritants,that can cause some inflammation and burning sensations for some folks,especially if you're sensitive to histamines and terpines.

I'd like to give y'all a tip,don't throw away your stems and seeds and any little chunks of weed that fall out when you're rolling a doobie. Instead,throw em into the bottom of your stash box-after it builds up to a good little pile,dump it all into a flour sifter with a wire loop that ya turn,and holding it over your stash box lid,and covering the top with your empty baggie,and turn the handle and you'll be surprised at the amount of weed and resin glands that'll come through the screen..you can recover a couple of doobies worth of smokable weed and resin glands,pick out the small stems that fall through of course..that way you'll git your money's worth out of every bag.

Have a good one ...Torog