..There is NO synthetic marijuana. that's just a name these are just chemicals sprayed on plant material without any purity of standards to sell quasi legally. Spice/K2, sometimes called “fake weed,” is a synthetic drug known as a cannabinoid that acts on the same receptors in the brain as marijuana. It's often sold as . 21 Nov 2015. If you've made the commitment to stop using Spice or K2, you may wonder how long the chemicals are likely to stay in your system after your . 9 Jun 2017. However, it's also possible that, just like marijuana, Spice can be. We can't say how long Spice stays in one's system because each case is . 29 Jun 2013. Teens using "spice" or synthetic marijuana are suffering strokes and TEENney damage. Since I reported last summer about the dangers of K2/Spice, or synthetic. Soon after the report came out, Anderson Cooper invited Dr. Ian Smith to about side effects from spice use; please add your comments below.