this might be just the thing, I haven't tried it though
Dunhill E-Liquid - MyFreedomSmokes.com it has a lot of good reviews, I had thought about trying it myself since Dunhill lights & American Spirit lights are the cigs I used to smoke
maybe try virginia from backwoods brew, it's cig-like and not sweet at all. I tried it in 24mg which turned out to be too high for me though and the high PG was irritating and scratchy for me.
Since he smokes the lights (like me) maybe also get him some Grizzly Vapes kokobear or Nanner Bear, they have high VG and a tobacco base but with other flavors added in. I love koko bear and I think I'll try nanner bear next just because i love koko bear so much. It has a earthy flavor that is nice for when you want a cigarette, it's kind of a soothing, calming vape. It does have a touch of sweetness but not in a cloying way. People are gonna start thinking I work for them because I talk about it so much, lol, but it's one of the few really satisfying liquids i've had that i keep going back to. The guy who crafts this only makes 3 flavors and I think he took a lot of care making this, it's pre-steeped and good to go right away too
U.S.A. E-Liquid
Oh i just thought of two more that might appeal to a dunhill smoker:
http://www.heathersheavenlyvapes.com/store3/index.php?main_page=product_info&cPath=1&products_id=166
Big Spirit is supposed to mimic an American spirit, which is close to a dunhill, if your friend likes additive free tobaccos like those he might like this
http://www.naturally-extracted-tobacco.com/product-p/big-spirit.htm
"A classic, all-natural, no-additive cigarette-style tobacco was used to make this e-Liquid. It is medium-bodied for a cigarette, dry and as close to smoking one as we have ever tried since we took up vaping! It has subtle black tea-like notes on a backdrop of cigarette tobacco.. Try it and see for yourself!"
I think I might try that one too. When i started i used a tobacco flavor from a local store, it wasn't a very good one but it worked anyway. then i switched to fruits, but now and then still i do like a tobacco.
Just one more thing, if he smokes a mildish cig like dunhill light he might like 100% VG, I find that high PG gives too much of a scratchy irritating feeling,, the VG is so much smoother.