Synthetic Marijuana Spice. What is it? They are chemicals that are made by man, these chemicals alter the minds of humans. It can be vaporized to be liquid and can be inhaled through e-cigarettes. The popularity of Synthetic marijuana or spice usage and addiction is growing alarmingly every day. They are called synthetic marijuana or spice and this name is misleading because one might think it is like the marijuana plant but then its potency is higher… "What is Synthetic Marijuana?"