Marijuana is an illegal drug for most countries. It contains some of the same chemicals as tobacco which can harm the lungs. But now, marijuana or we can say medical marijuana is used for curing various diseases. Medical marijuana is a medicine which is extracted from Cannabis sativa or Cannabis indica species. It contains three major active compounds which are THC, CBN, and CBD. Medical marijuana is used for relieving symptoms or treating various diseases and conditions. The use of Medical marijuana is limited because it has both pros and cons. Marijuana was used as a medicine around the globe until the early 1900s. Now it becomes illegal due to its misuse as a harmful drug. What is THC? Tetrahydrocannabinolis or THC is a psychoactive compound which is found in marijuana. When people say "feeling high!"; THC is responsible for it. Dronabinol and Nabilone care two man-made drugs which are synthetic forms of tetrahydrocannabinolis. These drugs are used for preventing