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. More.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.