Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. IQ is an acronym for intelligence quotient, which generally describes the score of cognitive abilities, determined by a standardized test. First IQ tests have been introduced in the middle 1900s by French psychologist Alfred Binet, in order to identify school children who needed special education due to their “slow” mental development. Recently, scientists from the University of Otago, New Zealand, associated cannabis smoking to lower IQ in young people. Learn more about cannabis impact on intelligence quotient, by reading this book.