ill make it a little more confusing or probably less for people who understand, there are really only 2 types of "bongs" ones with a choke/shotgun and those that have no hole to cover, instead the bowl gets pulled out of a slide to let fresh air in (what some people refer to as a "shum"). and the majority if not all "shums" contain bowls with no screen or filter of any kind, alowign the spend ash and weed to flow straight threw to the reservoir. i have pretty much only used a "shum" since i known of there existence.

now my point is pulling a full bowl even at little as .3 threw a screen is usually a task, the smoke dosent get thick enough or it clogs the screen and does not alow a clean hit. basically its hard to get a clean hit from a bong without sacrificing part of the weed, or in some cases pass it to the guy next to you to finish. also a "shum" requires close to no clean up or clearing between bowls the ash gets pulled threw so your more inclined to just fishing the bowl, and not attempt to get any last smoke from a spent bowl.

so after all that what i am gettign to is the people on here who believe in 1 bowl, 1 person, 1 hit(including me) probably mostly if not always smoke from a "shum" and the people who share bowls and pass around the bong probably use a bong with a screen of some sort.

anyways thats my 2 cents