doing a little quick- very rough calculating. Someone mentioned that it takes 5 puffs on ecigg to = 1 puff of real cig nicotine-wise, (and htis is for hte high nictonine I assume) A real cigg is roughly 10 puffs, so it would take 50 puffs off an e-cigg to = one cigarette nicotine-wise. (And let's not forget that the nicotine diminishes with each consecutive puff, so these figures will be on the high side of htings nicotine-wise)
Now, if 98% of the nicotine is absorbed in the lungs with the e-cig (accordign to one estimate) that would mean that for every 50 puffs of ecig, only 2% of 24 mg is filterign into the air via the vapor on the first few puffs, and even less as we continue to puff (unless we change hte cartridge frequently)- of that 2% most is stickign to walls, cieling, tables etc as te vapor tends to land on objects, and very little is actualyl floating aroudn even htough it looks liek alot because the clouds of vapor look menacing.
If you've got 10 peopel esmoking, only 20% of 24 mg nicotine is floating around at the end of 50 puffs per person which amounts to roughly 4.8 mg of nicotine, which again much will find it's way onto objects and not actually be inhaled as 'second hand' vapor lol- Each non vaporer in the room will only get a fraction of that 4.8 mg as the nicotine will be widespread throughout hte whole room, and not all concentrated in one spot. Nicotine when it is exposed to the air quickly breaks down as well. So, At hte end of the4 week- provided a non vaporer were to go to same pub each night, and 10 people were vaping every night, the non vaporer might end up with .o1 mg more or less of nicotine in their blood system total
Someone correct me if I'm wrong, but me thinks that a room filled with esmokers all puffing away liek mad won't produce enough to even be worried about
(I've never been good at math, so if I'm off on htis feel free to correct)