Anyone carrying a deck of cards, well - perhaps they like to play solitaire.
Anyone carrying two decks of cards - perhaps they're going to a poker game.
Anyone carrying three, four, five, six, a dozen -
?
Also, having your fiancee bump into your arm at the dinner table and triggering a puff of smoke from your wrist is absolutely dead normal to a magician - while your hosts/guests might get a little freaked out, especially if they can smell the smoky fragrance...
Hell, anyone wearing a Deck Dropper, Pure Smoke, Gecko, Raven, Black Widow, etc. as a matter of course doesn't exactly strike the general public as "business as usual". My fiancee calls my Pure Smoke my "man bra"!