Chapter 7: Substance Use and Abuse

Addiction develops through repeated consumption of psychoactive substances and manifests as physical dependence, characterized by tolerance and withdrawal symptoms, and psychological dependence, where individuals feel driven to use substances to achieve desired effects or manage negative emotions. Substance abuse is formally distinguished from dependence by the presence of significant life impairment, including failure to meet obligations, risky behavior, and legal consequences. The development of dependence involves multiple reinforcement pathways: positive reinforcement occurs when substances produce pleasurable sensations, while negative reinforcement emerges when they alleviate distress such as pain or anxiety. Classical conditioning creates substance-related cravings through environmental and internal cues that become associated with drug effects, and social learning through peer modeling shapes expectations about substance use outcomes. Genetic predisposition significantly influences susceptibility to addiction, with hereditary factors becoming increasingly prominent in adulthood compared to adolescence when social influences predominate. Tobacco smoking, initiated primarily during adolescence through modeling and peer pressure, delivers nicotine that maintains use according to the nicotine regulation model as smokers sustain specific blood levels to prevent withdrawal. Alcohol consumption spans from moderate use with potential cardiovascular benefits to heavy drinking and alcoholism, with binge drinking particularly common among young adults and associated with cirrhosis, neurological damage, and fetal alcohol syndrome. Psychoactive drugs categorized as stimulants, depressants, hallucinogens, and narcotics present distinct abuse patterns, with marijuana representing the most widely used illegal substance. Prevention strategies address psychosocial risk factors through social influence training and life skills development initiated before adolescence, while policy interventions employ taxation and age restrictions. Treatment integrates psychosocial approaches including motivational interviewing and cognitive-behavioral therapy with chemical interventions such as nicotine replacement, medications that block drug effects, and maintenance therapies. High relapse rates necessitate relapse prevention methods that teach individuals to identify triggers and apply specific coping strategies, with multidimensional programs combining psychological support, pharmacological treatment, and ongoing community reinforcement producing optimal outcomes.