This may help, in a very indirect way.
I got one of those "free" NJoy King Gold disposables. Njoy was making a big to-do about how much this was supposed to taste like a "real cigarette" and some people seemd to be all wowie about the taste. I couldn't figure out what the hell it was supposed to taste like.
At the same time, this arrived in the mail. I had to get it just because of the insane graphics. And it was only $4.99:
Buy Quit Smoking Rechargeable E-Cigarette with 6-Refills (High Nicotine)
I swear, the lil dude in the cameo on top looks like GW Bush.
While I was sucking on the NJoy freebie a spasm of whimsy overtook me. I charged my "hitubes" up, popped one of those cartridges on and... it tastes just like an NJoy King Gold. Not kidding. If you had to do a blind test you would find it really really hard to tell them apart.
Considering the NJoy King packaging says "Made in China" I guess this shouldn't be all that much of a surprise...
So I would suggest looking at low end Chinese tobacco flavors. You might want to try Dekang PalMal or USA Mix too. Can't say either of those tastes like an Njoy (or a "hitube"), but the PalMal would be the closer of the two.