Synthetic cannabinoids are making their way into the market as a legal substitute for marijuana, because they can be packaged and sold in smart shops, where they are totally legal and can be bought as a substitute for the plant. But don't be fooled: products like Spice and others have nothing to do with marijuana. They are based on chemicals of dubious quality, which have not been tested on humans, and sold as recreational drugs, marketed with neither dosing instructions nor health warnings.
Alchimiaweb strongly recommends NOT TO BUY THESE PRODUCTS for your own health safety.