I have always had an incredible sense of smell, so perhaps the perfumy thing is more my nose.
Hi Newwell - I'm another crypto-supertaster/supernose. I haven't even stopped smoking (yet), but just cutting down on the cigs has really made daily life a bit difficult due to this - but luckily a menthol-loaded PV in my pocket is a sanity-saver when confronted with all the fleeting smells of the tram or a mall.
I would say go *very* easy on flavourings. The thing Hoosier talks about with too much being nothing, or very very unpleasant, is very true.
One of the few professionally made juices I have bought is a premium Tobacco Café (Liberty Flight's XO series). I could hardly taste anything at full strength. At 50% dilution the flavours are absolutely overpowering to me. I'm still debating what percentage to try it at next - who knows, maybe it will be a favourite at 10% (I'm talking 10% ready mixed *juice*, not flavourings, here).
If you are like me and tend to have an über-sensitive nose, I would recommend to just ignore all percentages people recommend. You will need to at least halve them to start.
With the exception of some Hangsen flavour concentrates (recommendation is 30%, I mixed at 15%) and my home made tobacco and cocoa extractions (which I made pretty weak) I have as yet mixed nothing with more than 6% total flavouring.
When you talk about "perfume-y", I wonder if you have mixed much tobacco? (I've mostly just played with tobaccos, no desserts or fruits except for plain mint and plain orange)
I've had some really weird experiences since I started mixing, there seems to be a few notes in many tobacco flavourings that are also rather common in some actual perfumes/colognes/soaps/etc:
- I've started frantically digging in my pocket in the tram because I was convinced my PV was leaking and stinking up everything - only to realise that it was the cologne on some guy who just entered...

- There's a person I see every week who uses a soap or something that has just the tiniest hint of (another?) fragrance note found in some flavourings - it was highly distracting before I figured that one out!
- And I realised a hair-conditioner I only sometimes use (the one that comes with some of L'Oreal's hair colourings) also has a little little tiny amount of something that is either the same or very close to something I've mixed with.
So far I have not steeped anything with cap off - I haven't yet come across a really unpleasant "perfume-y" taste in anything that I was that invested in (I have however experienced it, but only in dilutions of bought juices and in some very left-handed "let's see what this is" things - in both cases I ust put it aside, and two weeks later it was more or less gone).