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Weve known for a long time that when you heat a coil [in an e-cigarette] and it goes through the heat cycle, it will leach metals over time, says Brett Poulin, PhD, assistant professor in the UC Davis Department of Environmental Toxicology and senior author of the study

The only way to completely clean your carpet is to use a carpet cleaner, which you can rent at most hardware stores

If your pen vape kit has a top-fill design, remove the mouthpiece or top cap to expose the fill ports

However, there has been a gradual but steady entry of smaller RRPs into the rankings, says Haigh

While the decision to quit is up to them, theres a lot you can do to help