FUnny- I clicked on this thread because I'm a cat person, and like stories about smart cats.
As it happens, I'm also a "smart cart" person. I bought a box of smart carts from a brick and mortar vaping supply store here in Korea, and have rarely used anything else since. Essentially, a smart cart is a big, empty cartridge, almost like a tiny bottle, that has a tiny polyfil plug filling the end that makes contact with the atty's bridge.
You still have to use it with a regular attomizer. (I've only got 510s, but I think they make them for other models?)
I like'em. Hold a lot more than a regular cart, a lot longer life (in my opinion) than a carto. (For me, 510 atties seem to last almost forever.)
It's also easy to switch juice flavors. Take smartcart off, blow out atty, put on different cart.
They're a bit fiddly, though- every few days I have to sit down for a few minutes and adjust/change the polyfil in the plug- too much or too matted polyfil, and the carts don't wick fast enough. (Dry hits, yuck.)
Too little polyfil, or polyfil with gaps in it, and it drains too fast. (Gurgle gurgle flood.)
But they're a LOT less hassle than regular carts, without adding some of the hassles of tanks or cartos.
Bes,t
Ande