Sorry xyzzyplugh, I was thrown by the way you phrased your question, but there's no need to re-post. According to http://www.thesaurus.com/
there aren't that many. Apparently you can say 'to scent' and 'to perfume' and the rest are things like 'to be fragrant' and 'to smell sweet'. No single words in common use as verbs, though.
Okay Waterwolf. I did phrase that question ambiguously. What kind of fool am I [no answer required]. It's as I thought we got more negative words than positive words. I Must find a single word verb for 'to smell nice' - maybe from French? As our own fine language is lacking. Eh Spellmaster?