Students write down some ideas you have about marijuana and smoking or using marijuana. How is the action of THC in the brain terminated after about 30 minutes when half-life of the metabolism is much longer than that.

Cannabis has been used for both recreational and medicinal purposes since several centuries. Hashish, a cannabis preparation, was found in Egyptian mummies. Marijuana, Hashish, Bhang and Ganja are the most widely used illicit drugs in the world. These psychoactive products are obtained from the plant Cannabis sativa (Indian hemp) and some of its subspecies. Cannabis is perceived as a recreational and harmless drug in some countries, even in leading medical journals and in some sections of the lay press. However, in most countries, it is categorized as a drug of abuse and its use is strictly prohibited.Marijuana comes from leaves, stems, and dried flower buds of the cannabis plant. Hashish is a resin obtained from flowering buds of the hemp plant. Most cannabis preparations are either smoked, or taken orally after mixing with other substances (See Table 1).The prevalence of recreational use of cannabis has increased markedly worldwide, particularly among young people. A survey of schoolchildren in United Kingdom showed that more than 40% of 15-16 year old and up to 59% of 18-year-old students admitted to have abused cannabis at least once. India, which has a population of just over a billion, has 62.5million alcohol users, 8.75 million cannabis users, two million who use opioids and 0.6 million who use sedatives or hypnotics. A majority of cannabis users in India start abusing cannabis in their adolescence and quit after initial experimentation, while the rest develop dependence.Cannabis abuse among younger subjects is associated with poor academic performance and increased school dropout. Many studies have demonstrated that psychosis, violence, aggression, sexual encounters, accidents, and crime are closely associated with cannabis abuse. Cannabis use have been associated with conduct disorders, attention-deficit hyperactivity disorder (ADHD), and learning disorders. Evidence suggests that cannabis dependence in young people predicts increased risk of using other illicit drugs, under performance in school, and reporting of associated psychotic symptoms. Interestingly, the biomedical benefits of cannabis have also been recognized from millennia and it has been shown to have therapeutic potential as an appetite stimulant, antiemetic and antispasmodic. Similarly, other clinical conditions where the potential use of cannabis has been suggested include epilepsy, glaucoma and asthma.