

Nicotine isn’t really harmful, aside from the rediculously addictive nature it’s what a vasoconstrictor?
Much like caffeine it has some decent properties for focus / cognitive abilities.
The main downfall is how it’s consumed by the majority of the population. Durries are overall awful. The stench, accidental burns and all the inhaling burning plant matter leading to cancer thing.
I’d be pretty surprised to see lead solder used in these applications, lead free is the defacto standard and has been for a long time. Not in vapes but any consumer electronics device.
More than likely it’s the mesh coils used having some lead present.