A little bit of knowledge.

It was 1995 when the first synthetic canniaboids were created,Europe was the first continent to open the market with their brand "Spice".Ever since then,people have been smoking their own versions of herbal incense to catch a buzz,all along knowing the dangers.I mean,it does say "NOT FOR HUMAN CONSUMPTION"right on the packaging.The U.S. Government has already banned the first year generation of the compounds stating that it is similar to HU-210,a compound that is very similar in structure to THC(tetrahydracannabinol).Since then,there have been many other variations of brands created in the states finding legal ways around the ban calling the new brand "2nd generation".Although,there are a few states that have banned all herbal incense.
Initial tests of Spice,and similar products found no illegal substances and were not able to find out where their buzz was coming from.The tests also were unable to detect most of the herbs that the products are supposed to contain.
2008, Volker Auwarter, ScD, and colleagues in the forensic toxicology lab at the University Hospital Freiburg, Germany, found that the products contained at least two different designer drugs known as synthetic cannabinoids.Like THC, the active ingredient in marijuana and other forms of cannabis, these synthetic cannabinoids turn on the cannabinoid receptors found on many cells in the body.But most synthetic cannabinoids are quite different chemical structures from THC. And unlike cannabis, the new drugs HAVE NEVER BEEN TESTED ON/IN HUMANS.The good thing is that it does not show up on a drug test,the bad thing is that incidents have went up over the past 3 years from 0 cases in 2007 to 350 in 2010.In my personal opinion,as long as you be responsible with the product at hanb,you should be fine.Here's a link to Amazon if you would like to try some.Damiana Leaf 2oz I personally smoke California Kronic3x,5x,7x,and have recently tried another spice by the name of 210.Both are created by Baja Dreams LLC.If you guys have tried another type,please divulge..I love learning!