Review of 4U Blend Flavor-Cap:

Compared to RY4 Double, it has a lighter, sweeter caramel paired with the same tobacco note. There's a non-offensive slight nutty undertone + a non-offensive, yet strange cotton candy note (Ethyl Maltol) that develops after a couple days of aging and fades by around day 4-5. Aging also brings the tobacco/caramel forward.

TFA RY4 Double has a burnt cotton-like note that bothers me, but this 4U Blend is nice and clean.

Of the 20-ish fake tobacco flavors I've tried over the years, this one is the overall best and one of only a few that I'd recommend trying. There's nothing perfumy or offensive here, and the profile is simple enough that there's room to experiment with the addition of other flavors in order to tweak it more to your liking.