I've been a none smoker for 3 months or so. I have had the odd lapse, but i haven't enjoyed it. I haven't noticed any difference in anything either BR, but i do wonder whether that's the smoker in me convincing me smoking is actually every bit as good as i fondly remember.
I have quit before though and definitely felt the benefits then.
I still wake up sometimes with a mouth that tastes like an ashtray. The most logical reason that I can think of is that I am still exhaling fumes from all the crap that is still in my lungs, either that or it could be something psycological (sp).
Either way that, and other side effects, can be quite unpleasant even after all this time.