My take on this is... once years back i done this only because the weed had been so good the stems where a bit hairy so i thought id break um up and try um on my bong but i worked out i think the high was just from the oil in the bong bowl they smelt like bonfire and tasted harsh.......so my recomendation is to get stems from good weed get a new pipe or bong and try it thats the only way to find out....the key is to never run out of weed then u will never have to do this and if your weed is sold to u with big long trunks on this is why its running out fast....lol all buds minamal stems : )