alcohol in ejuice

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rolygate

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Flavours can break down over time. This is related to things like:

Organic or synthetic flavourings - synthetics will last longer.
Temperature - the cooler a ready-to-vape product is kept, the longer it will last; although most e-liquids have a finite lifespan. (Unflavoured base has a much longer shelf life.)
The base type has an influence: PG may help to preserve flavours longer.
Many flavours lose their potency within a few months. Some have expired after 2 weeks, some last over a year.
When organic flavourings break down they may create fermentation products, and these will taste unpleasant.

We have not seen any cases of 'fungus in the lungs', with millions of posts here, so it seems unlikely.

PG, one of the base components in e-liquid, is one of the most powerful bactericides and virucides known, when dispersed as an aerosol. This is one reason why it is used as the excipient in nebulisers used by lung transplant patients. Not sure what action it has on fungus spores though. It may be that fermentation products produced as a result of the breakdown of flavourings over time are being confused with fungus. E-liquid with expired flavours either tastes completely dead (neutral) or unpleasant.
 

Hoosier

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... Would someone please explain that.

Sure, I can explain it.

Some folks like to tell stories, spin yarns, let loose whoppers, or otherwise make stuff up. These kinds of stories have the best reaction when told to others who are ignorant of the subject matter. So new things are great, so are old things that are a mystery to most folks. I knew a guy who got a real kick out of explaining the electricity in the wall outlet needed to be stopped from leaking out and running up the electric bill. Of course the electric company wouldn't tell you the truth because they would lose that income from all that leaking electricity from your uncapped outlets. Heck, he would even sell you some caps to put on your outlets to stop that leaking.

Same kind of thing with your story. A whopper was told and repeated as fact. It happens with alarming frequency.
 
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