What are the benefits and advantages of e-cigarettes?

The dependence of e-cigarettes on nicotine has not been eliminated. In this regard, e-cigarettes are a substitute for paper cigarettes, rather than quitting smoking. The advantage is that there are no carcinogens such as tar generated by combustion. In addition to reducing adverse effects on the body, it also has significant environmental benefits.
For example, the air in the room will be better, and there will be no traces of oil fumes or burnt smell in the clothes and home.
Disadvantages, I don't know yet. The main components of electronic cigarettes are propylene glycol (solvent), glycerin (glycerin) and nicotine (I no longer use essence). We ignore nicotine. Will die. Propylene glycol and glycerol are both used as food additives and can be digested by the human body. Of course, there are dosage requirements, and it must be less than a certain dosage... Regardless of the dosage, those who talk about toxicity are all hooligans.
What are the benefits and advantages of e-cigarettes?
No matter what food additive it is, one liter can be tried? According to the formula and dosage of tobacco oil, this dosage should be harmless to the body, but it is still unclear that the toxic dosage of propylene glycol glycerol in previous medical and food hygiene standards refers to the ingestion of electronic cigarettes by the lungs when consumed in food by adults. Is there any other harm in the middle... it is not yet very clear.
After all, the invention of electronic cigarettes has been around for over a decade and still needs to be proven. Many countries prohibit e-cigarettes, not only in public places but also in commercial activities. They just don't sell it to you. For example, electronic cigarettes can hardly be found now. The main reason for this situation is not known or unknown hazards, but taxes! The tax revenue of the tobacco industry is different from that of ordinary goods, reaching 59.5%! Taxation on e-cigarettes is clearly a loophole.
Only regular electronic products and even small goods are taxed, and most of them are tax evasion! If everyone smokes e-cigarettes, the national fiscal revenue will decrease by 6%, which is a terrifying number.
Moreover, tobacco was originally exclusively sold by the state, and e-cigarettes can be sold by anyone. How to obtain it? Crimes similar to those of ancient salt smugglers.
So, in the current situation where the laws and regulations in this area are not perfect, it is not common to cut them all at once... and there is no need to complain.