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I also remember reading about the heat of the coils causing "nano" copper particles to be released/inhaled, might be a contributing factor.

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Most modern vaping devices use coils made of 316 grade stainless steel, which has no copper content. Unless you're doing something really stupid, the release of metal particles should be within OSHA limits by several orders of magnitude.

> Most modern vaping devices use coils made of 316 grade stainless steel

No they don't.

SS316 is an option, but not the most common. NI200 is still by far the most common coil material.

i have to disagree. you're both wrong. the most common in all coils is Kanthal A1. If your building your own coils then NI200 is quite popular atm, but most tank and coil systems use Kanthal.

Coils aren’t made of copper afaik, they are made out of steel or any other metal with high resistance.

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