I've used Spark 20 twice. I was skeptical when the headshop told me it was as good as the real deal but he said he had repeat customers and I had some extra cash. It doesnt look like pot or smell like it at all. I"ve done some research myself because it got me more stoned than some of the higher grade shit I can find around here. It was pricey but worth it, it kept me really stoned for at least 2 hours off one hit of it. The health ramifications are very very low. Matter of fact I found some of the ingredients of it and some are actually very helpful. The active ingredient that causes the high is JWH-018 and is four to five times more potent than tetrahydrocannabinol, more commonly known as THC, which is the main psychoactive substance in cannabis. The chemist who designed (and lent his initials to) JWH-18, John W Huffman, an organic chemist at Clemson University in South Carolina, told Chemistry World that his goal had been to make a simple compound to study structure-receptor relationships. The compound interacts with both cannabis receptors.JWH-018 has not been licensed anywhere in the world for medical applications and little is known about the effect on humans, as not even pre-clinical studies have been to determine potential toxicity. Steup says he is inclined to believe it is not toxic, and that he would be more concerned about any lingering impurities from the production process. Hope this helps you out a bit. I'm sure this thread is might old but if anyone else comes here they can see my post.