Cannabis Use Disorder (CUD) is the dependence on marijuana / cannabis to feel good regardless of its mental and physical damage. THC is the main psychoactive element of marijuana / cannabis, with mind-altering and health-damaging abilities such as permanent loss of IQ (if started young), significant driving and athletic impairment, growth and brain development damage in utero, low motivation—which damages relationships, schooling outcomes, and job performance—and possible depression, psychotic and suicidal thoughts, and anxiety.
Marijuana can be smoked, vaporized, cooked into food, or diffused in drinks or other liquids. Smoking THC resins in the form of hash oil, wax, budder, or shatter delivers dangerously higher amounts of THC. Vaping THC is causing hundreds of severe lung diseases and several deaths. The onset of the effects of cannabis is usually felt within minutes when smoked and can last for two to six hours, depending on the amount used.
In the United States, approximately 50% of the population has used marijuana / cannabis, with numbers rising; and approximately 9 to 30% of users develop cannabis dependence. The largest group of marijuana users are those in the 18 to 25 age group, with almost 4% of 18-year-olds vaping THC daily.
Recreational use of marijuana has been legalized in some countries and US states.
Medical use of marijuana, requiring the approval of a physician, has been legalized in a greater number of countries.