It surely won't be 80% propylene glycol. And that's the stuff you see as vapor.
Besides, using a Big Pharma product has to be more expensive than using e-liquids.
I PM'd Dr. Loi on using e-liquid on a Band-Aid pad as a "patch" overnight (I always wake up wanting a cigarette!). Doesn't work well, he said. I tried it. He's right. Doesn't work well. And ingesting this stuff to the stomach by any method is an invitation to problems, since our digestive tract messes up nicotine and oral consumption invites pancreatic cancer down the road. I think we're stuck with puffing nicotine-laced liquid.