Well, recent research shows that something like 80% of all notes have traces of cocaine
on them, probably due to their dual use as firstly a funnel
and then a straw
in this highly expensive sport
. Maybe that is what gives money its 'je ne sais quoi
If so, i strongly advise no longer sniffing money due to the possible bad side effects that it may entail, including an addiction to money. (see hyper capitalism)
P.S. Its not just American money that has the distinctive smell, Every currency that I have come across has it.