the stems you can throw awat, but anything that has crystals (or that look like it has some white almost powdery stuff on it) you smoke that for shuredont get too crazy with separatin' leaves ans shit, anyone that grows has done that for you already or the weed itsself wouldnt have dried/cured properly, so dont over do it!!!

if anything just break it up,put it in your bong/pipe and smoke it up!!