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The Eleventh National Survey of Drugs in School Population carried out by the National Service of Drugs and Alcohol (SENDA), is a sample of 54 thousand students, indicate that the prevalence of marijuana use has increased, reaching 34.5% in 2015. 18.9% of students of Eight grade declared that they used marijuana in the last year, which represents an increase of more than three percentage points compared to 2013 (15.7%).
The World Health Organization (WHO) in it latest update 2016 of the health and sanitary consequences of cannabis use for non-medical purposes revels that: “Cannabis is the most widely used illicit drug in the world. In 2013, is estimated that 181.8 million people aged 15-64 years used cannabis for non-medical purpose worldwide”. In addition, it is concluded that in short terms, its act negatively on THC- responsive receptors, which are distributed in the brain causing intoxication marked by disturbances in the level of consciousness and influencing areas of control of decision making, motivation, memory, precision, and motivation of latency, motor coordination, mood, and cognition. In long-terms the document supports evidence that the health and social effects in non-medical cannabis use are related to the risk of developing psychotic symptoms and schizophrenia.