this post was submitted on 27 Jun 2025
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chapotraphouse
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I commented this above but for visibility
Research here
They analyzed the vape juice themselves as well as doing a simulation of 100-500 puffs into some sort of wool.
Even in "virgin" e-liquid, there were still significant amounts of heavy metals in them, indicating that heavy metals from the coils and battery connectors were being absorbed by the e-liquids without any puffing needing to take place.
The big heavy box mods had less heavy metals in them after puffing, so did Juul devices (which use ceramic coils).
This is all speculation on my part, but I'm assuming that the main issue is these disposable devices sit on shelves for an unknown amount of time.
Due to this, I'm assuming that because the e-juices are in direct contact with the heating elements while they sit on shelves for months on end allows for more absorption of heavy metals into the e-juices.