Although the term is fairly new to the common lexicon, the word "anti-social behaviour" has been used for many years in the psychosocial world where it was defined as "unwanted behaviour as the result of personality disorder." For example, David Farrington, a British criminologist and forensic psychologist, stated that teenagers can exhibit anti-social behaviour by engaging in various amounts of wrongdoings such as stealing, vandalism, sexual promiscuity, excessive smoking, heavy drinking, confrontations with parents, and gambling. Anti-social behaviour is typically associated with other behavioural and developmental issues such as hyperactivity, depression, learning disabilities and impulsivity. Alongside these issues one can be predisposed or more inclined to develop such behaviour due to one's genetics, neurobiological and environmental stressors in the prenatal stage of one's life, through the early childhood years.