Blunts are over-rated. Only thing I really like about 'em is the convenience when your out, especially with multiple people 'cause a joint ain't really good for 3+ people.
Anyway, just ask anyone you know who smokes or what, and if you ever see someone you think might smoke, go ahead 'n ask 'em. Don't worry too much about cops, just don't stand outside a gas station all day asking like 25 people, 'cause that'll bring attention.
But if you ask a person or two every once in while, no ones gonna' care.