nope, its because joints are the most effective form of smoking

so if you smoke the same amount of the same weed in a joint vs a bong, you will get more thc from the joint

some ppl claim they get higher from a bong, but that is either because they just take bigger hits and cough alot, or are suffering o2 deprivation from holding hits in too long, a placebo effect, or a combination of all 3

i have found that less weed packed in a bong will get me higher than the same amount in a small joint, but won't last very long at all when compared with the joint.