I think the excessive amount of heat to the lungs not to mention the chemicals, can do damage to the lining of the lungs.
This can aggravate respiratory conditions ie. bronchitis, asthma.
- some of us are compulsive / addictive types (having been smokers for years as well) and I am pretty sure chain vaping will have a cumulative effect.
just my opinion. it may be obvious but I've never seen much mention of this in my 4 years of vaping and reading ecf.
Any comments?
Vaping produces a very low heat actually, about 50-60 degrees celsius, whereas the heat from a lit cigarette is more like 400 degrees. It doesn't take much heat to vaporize a liquid. There has been some evidence that cranking up the voltage real high on a battery will heat the liquid enough to produce concerning levels of carbonyls (i.e. formaldehyde), but these tests were done using a smoking machine - the conditions under which the testing was conducted were something that no actual vaper would replicate in casual use. In the end, tests are showing the heat produced when vaping is relatively safe.
Respiratory conditions can be aggravated by inhaling vaporized PG, but when this happens the vaper is aware of it (he'll have symptoms) and can therefore change to VG or quit if he chooses. Some flavors can be irritating as well but again, the vaper will know.
Many people have been on this forum for 5 years or more and are not reporting any major adverse effects from long term vaping. It is possible that it could lead to minor respiratory issues over a very long time (say, 20 years), but this still pales dramatically to all the problems caused by cigarette smoke over time, so it is still a much safer alternative. Realistically speaking, e-cigs are so new there simply hasn't been enough time to determine the long term effects (although the lack of long term studies is being held up high by some as a "good" reason to ban them, and I don't think anyone here would agree with that...). Long term use of nicotine is well documented, however, and has been approved by the FDA; as far as we know there are no major long term consequences of that, but it is hard to say given that most studies on nicotine have been done on smokers.
So live strong and vape on

you've got nothing to worry about.