Probably not, unless there are very specific substances in the liquid being vaped.

There are two known culprits: diacetyl is/was used in some flavorings for its buttery taste, and liquid Vitamin E oil was used in clandestinely produced THC vape cartridges (which are really not relevant for the topic at hand). Both of those have largely disappeared from the market.

Sure, some cheap components can in theory leach heavy metals into liquids. The amounts are insignificant compared to what you will be breathing in just by walking on city streets, even outside rush hour.

And at least vapes don’t contain polonium-210 like cigarettes do.