things do not waste weed
people do, the only wasting is when someone lets whatever amount of smoke not in there lungs of course which usually isnt alot
bongs and joints get you the same amount of high, it all depends on how big a hit you take, in a way you could think joints get you less high, because there a bit harsher which could lead to taking a smaller toke, but any way you do it your getting the same amount of high as long as your smoking the same amount of weeed.
some people i hear saying bongs eat weed, which isnt true, its all dependant on the person smoking
hopefullly this helps some people