Hmmm, when I switched my breathing got better. I switched over as compared to dual-using. I noticed a change after about a week or two if I remember correctly. But, it probably took longer to really get my windage back. I imagine it takes a lot longer, I just noticed it that's all.
I started at 11-12 watts and 24mg nic, which was the norm back then. Sub-ohm stuff wasn't really mainstream. Anyway, the stronger nic gave me confidence because I FELT it. By lunchtime that day, I knew it would work. Anyway, keep your set-up filled and with you at all times, BUT, just take 3-4 draws when you feel the physical desire. I actually learned to keep my set-ups just out of my line of sight so that I didn't just over do it and get to much nic at one vape moment. It takes longer for vape nic to get into the system as compared to smaoking a cig. Anyway, take 3-4 draws and sit it nearby. then, when you feel the urge, do it again. For me, it was about 45 minutes.
Obviously, if you want to chain vape, go low on the nic.
Being somewhat constrained to lower watts I had to go higher nic. But, I did learn that first thing in the morning, I liked a bit more nic. Just like smoking. I also learned that if I sat in front of the TV, I would vape more. What I also learned was that it was convenient to have multiple toppers with different nic levels in them. One for early morning and a coup[le for the sofa time. During the day I like to switch flavors because my taste buds get bored, so that means 3-5 more toppers.
Your taste buds are probably damaged from cigs and your sense of taste will take awhile. Just worry about getting the nic you need. You are not getting all the bad chemicals, so vape to your needs say. If you get a sense of nauseous, you just got extra nic. Lay down and relax for an hour.
Life is sooo much better.
Good luck!