There was a time when head shops were pretty much about one thing: drug paraphernalia. Then came the war on drugs. Some head shops folded; others diversified. When Jay Work, owner of Grateful J's Dead Head Shop, opened his store, he took the latter approach. His five-year-old business offers body piercing at its Margate location and glass-blowing lessons at the Boca Raton branch. A selection of colorful glass pipes is available at both joints -- "sold as art and not intended for smoking," of course -- along with other accessories meant for use "with tobacco only." J's also offers the requisite incense and T-shirts, as well as a smattering of "adult toys" and a full line of licensed Grateful Dead products. But what really sets his operation apart from others of its ilk in SoFla, says Work, is the tape exchange. "We're the only store that gives away music," he explains. Take in a blank tape, choose from the huge inventory of live Dead shows (dating back to 1965, and all authorized for reproduction by Grateful Dead Productions), and J's will copy it for you.