It took me less time than most, I think, but it will hit you. For me, cigs started tasting bad, even though I still wanted them. Eventually I just decided not to buy another pack. It helped me to NOT have them on hand. I was a pk/day smoker as well, and I drew deep and smoked em to the filter. I started with 18 mg for me, and that was enough, but maybe you need to move up. Also, filling my own cartos made a difference. I feel like I got more juice, and better vapes, with the ones I filled myself. Hang in there, it will come for you!
ps....I am pretty new to this, but I started with the Volt, and its been a great system for me. As I understand it, its one of the better "cig" shaped models out there.