some shops wont let you in if you're underage, regardless of who you're with. it's not so much a state or local law, it more of a store policy. if you're shopping at a chill place, they wont care, but if the people there are dicks, good luck. a place like waterbeds n stuff cards EVERYONE going into the adult section, so it wont work there, but I'd think all 3 of the campus headshops here in Champaign, Illinois wouldnt give you a hassle about it...