Dear author, there was already such a question, and it was answered. thequestion.ru
I'll add some lyrics.
Now I don't want to talk about what is harmful and what is not. I don't smoke cigarettes myself, I steam a drip. All infa on the subject of harm from ES on the Internet is divided into 2 types:
"Research" bought by tobacco growers in the spirit of "This is terribly harmful, people are dying, their lungs burst, urgently banned !!" 100% marketing bullshit. This is especially popular on TV news.
Articles, forums, videos of the bathers themselves. They try to be objective, but you yourself understand that this is impossible in this case, since they are de facto "in the subject".
In the bottom line, you need to understand 2 things:
E-cigarette is not a way to quit smoking. This is a way to start smoking something delicious instead of nasty cigarettes and find yourself a new hobby. If you want to quit smoking, quit and do not deceive yourself.
There is not and in the near future there will be no adequate research on the harm from ES in the world. This is because too little time has passed since the popularization of the subject in the world, and such studies should be carried out in dynamics for a good period, for example, no one knows what will happen to a person after 10 years of vaping. For me personally, like most vapers, it is pleasant to think that the harm from steam is much less than from a regular cigarette, but I know that I am definitely not doing anything useful with my body.
The answer already given is more like a copy-paste from yellow magazines. Especially the phrase "a serious blow to the body when the circulatory system, nervous system, blood vessels, kidneys, liver, etc. are affected." ... as if a custom article from some cigarette company)
That's what I am found: A mixture of VG (glycerin) and PG (propylene glycol) harmful to the body, it’s silly to think otherwise. Anything that is not natural is harmful.
VG (glycerin) - when these vapors are inhaled, 80% remains in the body, 20% comes out with steam.
Further, what remains in the body is about 70 - 80% goes to food (fat). Well, it also causes diarrhea. There will be no constipation))
20-30% in urine.
PG (Propylene glycol) - has hygroscopic properties. This means that it dries mucous membranes (TH effect) What are the consequences? It impairs the protective properties of the lungs, and of all mucous membranes in general (drink more fluids and everything will be fine). There is a plus! Removes phlegm from the lungs.
With simple smoking, nicotine crystallizes and comes out with smoke from the lungs in the form of crystals.
When vaping (electronic cigarettes) it keeps PG from crystallizing. that is, most of the nicotine is retained in the body. Because of this, an overdose from ElSig is easier to get than from ordinary cigarettes. Accordingly, the passive smoker gets MUCH less nicotine from the steam.
It is better to mix the base yourself. Use chemically pure liquids, glycerin should not have a smell at all! propylene glycol has a mild sweetish odor.