It's well used. Jones empties the bowl with one long, hard draw and blows out a cloud of thick, white, musty smoke. "That was my fourth bowl today," he says, packing a fifth.

Jones started smoking spice regularly about a year ago. He works in the head shop industry and heard about it from co-workers. Because spice was widely available on the Internet and head shops around town, he didn't hesitate to try it.

The first time Jones smoked spice, he said it hit him like a punch in the face. "I was amazed," he says. "I was just warm all over and really, really high. My head was hot, and my ears were burning. It was like smoking chronic. I was like, 'Holy shit, this stuff really works!'"

Twelve months and several pounds of spice later, Jones is pretty sure the stuff isn't safe. It gets him high, but he says it also gives him headaches, stiff muscles, and on two occasions, temporary loss of vision. Once, he smoked such a high dose of synthetic cannabinoids that he found himself crawling around on all fours and vomiting.

Despite the pattern of ill side effects, Jones continues to smoke anywhere from an eighth- to a quarter-ounce of spice every day. It has replaced marijuana as his drug of choice because it's still legal in Arizona and it won't show up on a test for pot. But he also thinks he may be addicted to it.