I continued smoking, although significantly less, after starting vaping. I had a meltdown one weekend when a buddy and I were working on his truck. I had run out of cigs! At that point I was only firing up 1 or 2 a day, so there wasn't any reason not to just give em up completely, but having my "blankie" (i.e. a pack of smokes in my pocket for just in case) was still neccesary. He ran me to the store, and after buying a fresh pack, I didn't open em up for, like 6-8hrs! I didn't really want a cigarette. I wanted my comfort zone in being ableto fire-up just in case. I still have half of that pack of cigarettes from back in February. I couldn't tell you the last time I even considered putting one in my mouth, tho!
Good luck in your cessation, but I found it beneficial to taper off cigarettes, rather than a cut and dry change from cigs to e-cigs. Don't beat yourself up if the urge to smoke overcomes your need to quit. It's OK. Nicotine is the most addictive substance on Earth! Just keep your commitment and carry on if you fall off the wagon.
Happy vaping!