> Why not just sell a reusable vape that can be filled with the extract you want?

That's where the vapes started, and they still sell them.

I have a battery holder that's really just some control circuitry and a spot to shove an 18650. On that goes the tank which holds liquid and is refillable. Inside of that goes the "coil" which is the wick and heating element.

Daily I add a bit more fluid. Every 2-4 weeks I replace the coil. Every 1-2 years I replace the battery holder and tank. The 18650s I swap between to power it are 6-8 years old and still going.

(I'd replace the battery holder and tank less frequently, but I just can't find any that will last much longer than that banging around in my pocket and suffering the occasional drop or fall. All-in-all though, I've minimized the waste about as much as I reasonably can without quitting entirely.)

Somewhere in between and closer to what people are buying as "disposable" you can get refillable pods like my wife has. The "base" has a built-in battery and the circuitry. The tank and coil are a single unit. You add fluid and keep refilling until the wick/coil are gummed up, then toss the entire tank and coil... but keep the same battery/electronics.

Really, it's almost the exact same thing as these disposable units just with _very minimal_ changes to make them reusable.

Which is why I think these disposable units are extra heinous. There's just no reason for them to exist at all.