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Comment by allovernow | Hacker News Reader

>The inhaled aerosols of e-cigarettes contain numerous potential toxicities, some of which could be dangerous for health with long-term use. The safety of prolonged aerosol exposure is not known

Could be. The jury is out.

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The safety of a lot of it is known, and it's safe. Propylene glycol has been used for concert smoke machines for 50 years. Vegetable glycerin is used for all kinds of things, internal and not. Please don't spread misinformation.

https://www.ncbi.nlm.nih.gov/books/NBK507184/

http://europepmc.org/backend/ptpmcrender.fcgi?accid=PMC44877...

The fog from fog machines has cooled down by the time you inhale it. How much does a concertgoer inhale vs. a vaper over a given span of time? Is there a risk of the heated product causing damage to the lungs that fog at ambient temperature does not? Can the ingredients, when combined and heated, chemically react to form hazardous compounds?

I found one study where they had mice inhaling cigarette smoke extract (not even vape juice, and worse) five hours a day for a few months, and it caused some discoloration on their uvulas or something.

Here's something to take 12 seconds to read: https://www.sciencedirect.com/science/article/pii/S027869151...

And yet breathing around fog machines is uncomfortable and can cause real problems if you have asthma. Safe is a loaded term here.

Safe is relative, sure, but not loaded. Pretty much everything can cause real problems if you have asthma, it doesn't have anything to do with PG per se.

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