THC is an abbreviation for tetrahydrocannabinol. It is the most well-known and most abundantly available cannabinoid in marijuana plants. THC is also the component in marijuana that is responsible for the psychoactive effects, or the "high." Also known as delta-9-tetracannabinol, it was first isolated in 1964 and is thought to serve as a natural defense for the plant against pests. Research has shown THC to be an effective medical treatment for a range of conditions. There is no lethal dose of the compound in its natural form. Besides reducing nausea and stimulating appetite, THC relieves pain and is an antioxidant.
THCA is the major component of unprocessed cannabis. It is the acid form of THC and is not psychoactive. It has shown anti-inflamatory and antipasmodic properies.
Recent research suggests that THCV may be useful in treating type 2 diabetes. It also is believed to be effective as an appetite supressant.
A tincture is a liquid cannabis extract usually made with alcohol or glycerol that is often dosed with a dropper. Tinctures can be flavored and are usually placed under the tongue, where they are absorbed quickly. Effects can be felt within minutes. Tinctures can also be mixed into a drink, but in these cases effects will take longer because the tinctures will be absorbed by the digestive system.
A topical is a type of cannabis product where the active properties of the flowers have been extracted and added to a product such as a lotion or a cream that's applied to the skin. The medicinal properties are absorbed through the skin and can be used to treat muscle aches, long term soreness, or ailments like dry skin.
Trichomes are the resin production glands of the cannabis plant. In Greek the word means "growth of hair," and while these sticky little protrusions can make plants appear a little hairy, they are not hairs, nor are they "crystals," which is how they are often described. THC, CBD and other cannabinoids are all produced in these glands.