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Your study of second hand pot smoke and some about e cigs and vapourisers begs a question?
Is second hand/public marijuana vapour as dangerous as second hand marijuana smoke?
Vapourisation is a big thing these days.  people think using vapes is far healthier than smoking pot.  Personally it certainly feels that way.  Since I stopped smoking pot ans started using a vapouriser my ability to exercise for long periods of time and the way my lung function feels during exercise is heaps better thasn it was.  Very scientific I know.  Its definitely noticable tho.  The exercise I used to do is easier since I stopped smoking and started using a vape and it feels like my lungs aren't working as hard.  Thy don't feel the sort of scouring they did when I smoked or when exposed to large amounts of smoke in the environment.  (I'm a volunteer bushfire fighter and sometimes get massive exposures.)
The study you referenced above (26/7/16) by Jan Czogala is very interesting.  Personally I think its obvious that second nicotine will result from e cig use, and as someone who became addicted to cigarettes (i've since quit but it took 20 years) working in a pub/nightclub 25 years ago when smoking in pubs was legal (it isn't any more in Australia, where I live btw/obviously) this is a serious danger imo.  Nicotine addiction is hard to break.
If you do end up doing some research on whether second hand vapour is as dangerous (or even dangerous at all) as second hand smoke that would be great.  I'm writing this comment to encourage you in that direction.  i know all that stuff is dependent on funding, office politics availability of grants and whatever else, and if you're PhD student who knows what the future holds employment wise etc.
None the less its the obvious next step as vaporiser use is only going to increase.
Vaporisers (and ecigs or so i thought) are sposed to be good because they eliminate particulate matter in the vapour, or at least decrease it significantly.  Many people use vapourisers on the basis that no particulate matter enters their system - only vapour which is a gas as I understand it.  With pot the idea is to evaporate the terpines off the surface of the plant matter.  There is actually criticism by vape users that traditional ecigs and many vapes themselves don't prevent combustion and allow some smoke to be breathed in with the vapour.
So the questions I have are along the lines of "is there any particulate matter in second hand vapour?" and more top the point is the damage as bad (or even there) as second hand pot smoke.  Your study from 2014 seems to imply that its the smoke not the chemicals that cause the problem with second hand pot smoke  If this is true then does second hand vapour (if its free of particulates) have the same effect?
IE is the particulates that cause the problem wrt heart function and O2 transport.  In which case people might assume vapour is a safer (not necessarily "safe" btw) option (I do for example).
Anyway if you get the opportunity you (or your colleagues) should do a study to find out if it is.  (If you can obviously.)
Thanks for your time.

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