Yes some have filters or little fans that cleanse it and take the bad stuff out.

Heat kills off bacteria – yes. There are many more chemicals that bongs may have that can’t be filtered off via heat.

A question you’d have to consider is, what exactly makes up these bongs and why would they be able to filter off chemicals in weed (if any)? And what harmful chemicals are there in weed?

The way I see it, weed cannot make you “high” but may be an effective pain-reliever if used medically. It leaves a lot of room to say if smoking weed is anything medical.

Bongs honestly don’t do much to reduce tars and carcinogens that are in the smoke. They DO cool down the smoke and therefore it is smoother and less irritating. Although water filtration is better than smoking out of a dry pipe, it is really not all that much healthier.

What you want to invest in is a good vaporizer. Studies have shown that vaporizers eliminate nearly every carcinogen found in smoke. The taste is better, the high is more pure, and the health benefits over smoking are amazing. Sure, I wouldn’t call vapor completely harmless, sometimes thick vapor can still make you cough. But it is by far the safest way to ingest THC besides cooking it into food.

Not true, unfortunately. The water filters out a bit, but for the most part, it just allows a smoother hit because it cools the smoke. Bacteria has little to do with the negative effects of smoking. The most negative aspect of smoking, whether it’s from a pipe, a bong, or a hookah, is the lung damage. It’s unavoidable.

The least unhealthy way to utilize weed is to use a vaporizer, or to cook it into food (i.e. making cannabutter.)

bongs are healthier than a bowl or a joint/blunt but the best way to go is a vaporizer… this is because you get the most out of the weed and your not inhaling smoke its just thc vapor. but in the end bongs are the best smokig devices for weed if you dont want to drop 100-600 on a vaporizer