K2 is a kind of synthetic cannabinoid that is also known as Spice. According to the National Institute on Drug Abuse (NIDA), K2 and other synthetic cannabinoids are manmade chemicals that can alter a person’s mental state. These chemicals are usually sprayed onto some kind of plant material, which gives them a more natural appearance and enables the consumption of the substance through smoking. K2 is also sold in liquid form, so it is can be vaporized and inhaled through that method. This is commonly done with vaporizers and e-cigarettes.