As an engineering type I have the perfect answer.
Tiny batteries that only last as long as one cig would normally last you.
Carts to match the battery size.
...
They have that already Hoosier. It's called a "Blu"
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One habbit I had to break was Not constantly holding the PV. When I first started vaping, I noticed the no time limit issue like what a cigarette has.
After 10 or 12 hits on a cigarette, it was time to put it out. But I found myself holding the PV and just hitting on it. Maybe my mind was programmed to hold on to it until it was out.