Re: hookah auto seal
if the auto seal is designed correctly it really shouldnt make it harder to smoke but most of the designs out are not in that category.
in short it seals it off so you dont plug the hose, a little more depth its what is normaly called a check valve, it allows fluid (in this case air/smoke) to pas one way through it and not allow it to back flow. it is normally a bb that sits in a piece that one side the bb plugs the hole while the other side is more open, prevents the bb from coming out but allows air to flow around it. IMHO mya auto seal is wonderfully designed (standard hose port that just has a bb dropped in and a screw threaded into the side that stops the bb from coming out.