Question

What fraction of the vapour in electronic cigarettes is water?

Answer 1

Electronic cigarettes use propylene glycol and/or vegetable glycerin as a base liquid. This is heated and vaporized at a low temperature (my e-cig is 7 watt). When exhaled the VG/PG absorbs water from the air producing the visible vapour cloud

Answer 2

First off you can't be sure what temperatures your atomizer reaches purely by wattage because it depends on cool resistance, material and if you run your vaporizer in TC mode (I assume you do not have that option available).

Humidity will only have a visual impact on cloud density after you exhale. Depending on atmospheric humidity glycerin molecules will effectively bond with water in the air. The more humidity it is, the more water will be picked up.

The ratio of glycerin to water in the cloud forming then will depend on: - temperature - humidity - volume of air in which the cloud is expanding

What I'm more interested in is if this contributes to atomizers popping (especially open air ones like RDA's). Say I leave it standing on my desk overnight soaked in juice. What will be the liquid water % be then.

Also how does this effect contribute to nicotine neutralisation? I red that it gets broken after contact with oxygen and I guess that it will get plenty of it while floating in an areosol particle.

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