If anything, bongs will increase "pain killing properties." You get the same amount amount of useful smoke (thc cbd cbn etc.) out of a pipe as you do a bong, but with a bong it's filtered through water (and various other things if you can afford a good bong) so you can take a bigger hit at once from a bong resulting in you getting more high. The amount of pain relief has more to do with the strain than anything else.
If you are considering buying a bong, buy a good glass on glass bong that is at least a foot tall. Don't keep it around idiots, they do break and are not idiot proof. The way you smoke and the pleasure of smoking is an investment worth spending some money on imo. Percs and ice catches are nice too.