I tell people that vaping is what keeps me from smoking cigarettes. I also tell them that I can taper the nic level down if I decide to and quit vaping. You can't do that with tobacco.
A couple of things are relevant here. One is that we only get about 30% of the nicotine that we did from a cigarette, but it's enough to satisfy our needs. What we exhale has been determined by lab testing to be about 2% of what we inhaled, so it's not NEARLY as bad as the exhale from a cigarette. Each particle of tobacco smoke is coated with tar and nicotine. Those little products of combustion that make up cigarette smoke enter the alveoli in our lungs and deliver tar and nicotine. They are in the smoke we used to exhale, too.
Our lungs don't absorb much of the nicotine we inhale from vaping. The mist is not conducive to absorption by the air sacs in our lungs. Most of the nic is absorbed through the mucous membranes in our mouth, throat, and nose. Those are moist and the vapor merges with the moisture and that results in the absorption of nic.
Ecigarette mist harmless, inhaled or exhaled
Second hand cigarette smoke is a mixture of mainstream and sidestream smoke. It contains the same toxicants as mainstream smoke, but at reduced levels. It is responsible for about 8% of the deaths caused by direct smoking.
Second hand mist from an e-cigarette is not smoke at all, and does not contain any substance known to cause death, short or long term, in the quantities found. It becomes invisible within a few seconds, and is not detectable by smell.
Exhaled breath after e-cigarette use has been tested for CO only. No increase in CO was found.
The e-cigarette does not create side-stream smoke.
Exhaled breath after e-smoking contains even less nicotine per puff, as much of the nicotine inhaled is absorbed. Similarly, propylene glycol is largely absorbed and little is exhaled.
No harm found in e-cigarette mist
Nicotine is not harmful in the quantities mentioned.1
Propylene glycol is harmless – it is used in making theatrical fog and as an ingredient in soaps, personal lubricants and intravenous medicines.
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Education is crucial to the acceptance of vaping. It's not as safe as NOT vaping, but it is magnitudes safer than smoking tobacco.
Nicotine in inhaled ecig vapor contains about 100 times less nic than that inhaled by a cigarette smoker. The exhaled nicotine is said to be about 2%. Apparently, we inhale less but absorb more of the small amount we inhale.
Per the link I posted above.
Cigarette Inhaled nicotine per puff = 0.1 mg/puff
Ecig Inhaled nicotine per puff =0.01 mg/puff