As researchers become more familiar with identifying the biological and environmental risk factors that can lead to addiction, they are beginning to discover some of the differences between people who become addicted and those who do not. These risk factors form a complex blend in which the combined influences have been known to bring about addiction.
Genes: Genetics play a significant role: having parents with alcoholism, for instance, makes you four times more likely than other children to become alcoholics. More than 60 percent of alcoholics have family histories of alcoholism.
Personality: Many addicted people also suffer from mental health disorders, especially anxiety, depression or mood illnesses. Some people who suffer from social anxiety, stress-related disorders, and depression begin abusing drugs in an attempt to lessen feelings of distress.
Early use of drugs: The earlier a person begins to use drugs the more likely they are to progress to more serious abuse. In this respect adolescents may be particularly vulnerable because of the strong influence of peer pressure; they are more likely, for example, to engage in new and daring behaviors.
Social environment: People who live, work or go to school in an environment in which the use of alcohol and other drugs is common - such as a workplace in which people see heavy drinking as an important way to bond with coworkers - are more likely to abuse drugs.
Childhood trauma: Scientists know that abuse or neglect of children, persistent conflict in the family, sexual abuse and other traumatic childhood experiences can shape a child's brain chemistry and subsequent vulnerability to addiction.
Some people who start as casual drinkers or drug users may stay that way. But others will become substance abusers or dependent, feeling that they need a drug to feel alive or to help them deal with stress. The difference between abuse and dependence is not always clear to the general public, but there is a set of criteria that is used by medical professionals to distinguish between these two categories of problem use. The essential feature of abuse is a pattern of substance use that causes someone to experience harmful consequences such as a failure to meet obligations, engaging in reckless activities, legal troubles or continued use despite personal problems. Dependence is more severe. Medical professionals will look for three or more criteria from a set that includes two physiological factors and five behavioral patterns, again, over a twelve-month period. Tolerance and withdrawal alone are not enough to indicate dependence. And not all behavioral signs occur with every substance. The behavioral patterns associated with dependence are being unable to stop using, exceeding self-imposed limits, spending less time on other activities, spending excessive time using or getting drugs and continuing to take drugs despite deteriorating health