I think you have to shop around until you find something familiar enough to satisfy and comfort you. But it's tricky to find what that will be.
1. Many companies sell the Chinese (Dekang) PG juices and some of those have names like various cigarette brands (though I think the Marlb-y names have been changed to USA Mix, Camel might be Desert Ship). I found the Chinese PG stuff satisfied my craving but that was about it. Some other companies mix their own (may be VG, PG or VG/PG based) and give them names reminiscent of the brands. Maybe something with a similar name will hit the spot for you (of course this won't work if you smoked an unpopular brand)
2. Read and search the juice reviews section and the juice discussion subforum to see if you can find anyone mentioned your brand. And once you have enough posts (5?) you could ask in the juice discussion (not the reviews) section and maybe someone will have some suggestions.
3. You can go to the website of the brand you smoked and find their list of the flavor ingredients in your exact brand. Common ingredients you might find are cocoa, honey, brown sugar, licorice. My old favorite smoke had cocoa in it so I read the descriptions of tobacco flavors at lots of companies and found one that mentioned cocoa (Backwoods Brew's Casablanca) and I tried that - it sort of hit the spot for me. I does not taste like my cigarettes tasted but it's familiar enough to be comforting and satisfy me.