How could a bong possibly waste weed? Once you light it it goes straight into the water, then to your lungs, its not like it has anywhere to escape so u wouldnt get all of your hit. The only possible reason it might seem wasteful is because you can take sooo much bigger hits off a bong(hence its gone quicker). I mean think about it. Anyways i smoke about a quarter a week and its mostly from bongs.