Another big vote for Inawera's Am4a here. Remember that lovely smell of a freshly opened pack of smokes, well that is what Am4a tastes like to me. £3 for 10ml of concentrate and you wont want to mix above 4% or you'll absolutely destroy it, so 250ml for under £3. Outstanding value. Perfect for ex-smokers transitioning to vaping too as it's quite smoke like without being ashy, and only very lightly sweetened.
(I tried most of Inawera's other tobacco flavours after I discovered Am4a but sadly for me nothing else came close to the quality of Am4a.)
Chefs do loads of amazing dessert one shots but if you are looking for a really authentic cigar/tobacco then Don Cristo is well worth a try. The basic Don Cristo one, not the rest of the range (which was "meh" for me if I'm honest). Mixes at 25% though and £10 for 30ml concentrate. I've tried most Nets out there (including Stixx Mixx) and many other tobaccos and this is the most subtle but authentic tasting cigar I've found. It's a Net itself and won awards when it first came out but otherwise you don't hear it mentioned much - I think it's because those who discover it keep it to themselves to insure it doesn't go out of stock as it's quite hard to find in the UK.
For dessert I go for a 50/50 mix of Welsh Custard and Calipitter Chow (both from Chefs). No tobacco in it but well, my mouth's watering just thinking about it.
The above three keep me sane through the week, with Manabush Powwow Tribute and Firewater No2 shortfills added as weekend treats.