For the OP; I switched overnight. But, my taste buds were shot from smoking and I knew they would not let me taste much. So, I was just making sure that I got the nic that my body was demanding. I vaped 2-4 draws whenever I had urges. Those 2-4 draws at the nic level I used took away my need for 45 minutes. Then I did it again.
For you, at what nic level can you do the same? I would start with 24mg. Stay with only
vaping when your body tells you. Just replace using cigs at first.
Because my taste buds were shot, I only really tasted things like peppermint or candy cane. Boring at first, but I got away from cigs.
It worked for me. Good luck.