Cannabis strains are either pure or hybrid varieties of Cannabis, typically of C. sativa, C. indica and C. ruderalis. Varieties are developed to intensify specific characteristics of the plant, or to differentiate the strain for the purposes of marketing it more effectively as a drug. Variety names are typically chosen by their growers, and often reflect properties of the plant such as taste, color, smell, or the origin of the variety. Cannabis strains commonly refer to those varieties with recreational and medicinal use. These varieties have been cultivated to contain a high percentage of cannabinoids. Several varieties of Cannabis, known as hemp, have a very low cannabinoid content, and are instead grown for their fiber and seed.
Cannabis, also known as marijuana and by numerous other names, is a preparation of the Cannabis plant intended for use as a psychoactive drug or medicine. The main psychoactive part of cannabis is tetrahydrocannabinol (THC); it is one of 483 known compounds in the plant, including at least 84 other cannabinoids, such as cannabidiol (CBD), cannabinol (CBN), and tetrahydrocannabivarin (THCV).
Cannabis is often consumed for its mental and physical effects, such as heightened mood, relaxation, and an increase in appetite. Possible side effects include a decrease in short-term memory, dry mouth, impaired motor skills, red eyes, and feelings of paranoia or anxiety. Onset of effects is within minutes when smoked and about 30 minutes when eaten. They last for between two and six hours.
Cannabis is mostly used recreationally or as a medicinal drug. It may also be used as part of religious or spiritual rites. In 2013, between 128 and 232 million people used cannabis (2.7% to 4.9% of the global population between the ages of 15 and 65). In 2015, almost half of the people in the United States have tried marijuana, 12% have used it in the past year, and 7.3% have used it in the past month.