Whats the difference between a vaporizer and a bong or water pipe?
In a bong the herb (usually cannabis) is burnt, which then gives off smoke. The smoke is then filtered somewhat by passing through water before it is inhaled. But even after passing through the water, it’s still smoke, filled with tars and toxic gasses. A vaporizer doesn’t really need a water filter, as it doesn’t produce smoke in the first place. Filtering either smoke or vapor with cold water may not be such a good idea anyway, for as the MAPS/NORML study showed, the water will also filter out the active components of the herb (like THC), requiring one to smoke or vaporize more.