Cannabis , also known as marijuana among other names , [a] is a psychoactive drug from the Cannabis plant used primarily for medical and recreational purposes. Cannabis has various mental and physical effects , which include euphoria , altered states of mind and sense of time, difficulty concentrating, impaired short-term memory and body movement ,  relaxation,  and an increase in appetite. Cannabis is mostly used recreationally or as a medicinal drug, although it may also be used for spiritual purposes. In , between and million people used cannabis 2. While cannabis plants have been grown since at least the 3rd millennium BCE,  evidence suggests that it was being smoked for psychoactive effects at least 2, years ago in the Pamir Mountains ;  the earliest evidence found at a cemetery in what is today western China close to the tripoint with Tajikistan and Afghanistan. The possession, use, and cultivation of cannabis is illegal in most countries of the world.
DRUG ABUSE IN INDIA: AN OVERVIEW WITH SPECIAL REFERENCE TO CANNABIS
Drug Abuse Among Youths Research Papers
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The reward system the mesocorticolimbic circuit is a group of neural structures responsible for incentive salience i. The reward system motivates animals to approach stimuli or engage in behaviour that increases fitness sex, energy-dense foods, etc. Survival for most animal species depends upon maximizing contact with beneficial stimuli and minimizing contact with harmful stimuli. Reward cognition serves to increase the likelihood of survival and reproduction by causing associative learning, eliciting approach and consummatory behavior, and triggering positively-valenced emotions. Primary rewards are a class of rewarding stimuli which facilitate the survival of one's self and offspring , and they include homeostatic e.