I dunno.
The earth is pretty big, and vape batteries are tiny, and we keep finding substitutes.
I'm all for reducing waste, but it seems unlikely we'll run out of metals in our lifetimes.
Keep in mind, things keep getting more efficient, and rich nations are finally tending toward using LESS per capita.
Sure, the poor nations might eventually become rich and the global population has not yet peeked, but there's no reason to assume our materials usage will grow exponentially forever.
And, even if you assumed we were going to run out of whatever is in these tiny vape pens - the percentage of all usage going to tiny applications like this is a rounding error. It's not what you would attack if you really wanted to move the needle.
You'd probably try to reduce the number of people buying new cars, for example.