the first days, it was quite complicated, I still had a few packs of cigarettes when I stopped, and I was still smoking one or two from time to time when I was stressed, and I must admit I smoked all the cigarettes I had left before going full vaping but I didn't rebuy any.
It still require an effort to completely stop smoking, but it isn't as hard as just stopping. Don't hesitate to use the high nicotine dosage e-juice at the beginning and decrease gradually to lower content e-juice.