Well, i for one dont think bongs get me [personally] any higher. I dont particually like bongs that much anyway - I prefer joints as they last longer and make it more pleasureable for me while i smoke. A bong is over too quickly for me - and doesnt get me anywhere near as high as a joint would - even if i packed the same amount that'd be in a joint into a bong.

If some people find smoking a bong get's them higher - then maybe it does? Maybe it's placebo, maybe it's because they're not wasting any smoke at all, maybe it's just they get a bigger hit in one go, or maybe they're all lying? I dont know.