Alcohol and Alcohol Use Disorder _ _____________________________________________________________
corticotrophin-releasing hormone and dynorphin. Long- or short-term abstinence activates the antireward system, and with more abstinence, it becomes even more difficult to ignore with the attendant anxiety, dysphoria, craving, and anhedonia. Over time, with repeated administration, nucleus accumbens dopamine receptors desensitize, leading to a functional decrease in available dopamine, anhedonia, and decreased sense of pleasure. Real-world examples include an individual with alcohol dependence developing a sudden craving for a drink when watching a beer commercial, walking by a bar, or seeing a place where s/he drinks. This stage reveals one of the remarkable properties of addiction; the act of drug-taking transitions from being impulsive (i.e., pleasure-seeking without afterthought) to compulsive (i.e., undertaken to relieve stress, tension, or physical signs such as pain). Alcohol use disorders are often associated with dependence on or abuse of other substances, such as marijuana, cocaine, opioids, amphetamines, anxiolytics, designer or “club drugs,” and tobacco. Alcohol may be used to alleviate the unwanted effects of these other substances or to augment their effects or substitute for them when they are not available. Cocaine According to the most recent National Survey on Drug Use and Health, about 5.2 million Americans 12 years of age and older were past year cocaine users in 2019 [12]. Many cocaine addicts also use alcohol to enhance euphoria, to reduce the mania associated with intoxication, or to calm or reduce the impact of dysphoria caused by cocaine withdrawal. Use of cocaine impairs both mental and physical functions, including learning and memory, hearing and seeing, motor coordination, speed of information processing, and problem-solving ability. Alcohol use has its own set of impairments, but many overlap with cocaine use. The negative impact exerted by alcohol and cocaine on either mental or physical activities has been found to be greater than when either is used alone. This is due to the production of a compound called cocaethylene. Cocaethylene is a novel compound that is produced in the bodies of individuals using cocaine and alcohol. Cocaethylene has been linked to cardiotoxicity, neurotoxicity, overdose deaths, and acute functional impairment [242; 243]. The combination of cocaine and alcohol may be associated with other neurologic changes, including poor memory and poorer judgment. Alcohol use can also be a trigger for cocaine relapse. Nicotine Addiction As many as 50% of persons with alcohol use disorder smoke, compared with about 18% of the general population [12; 244]. In a cohort study of 845 persons who had been treated for alcohol use disorder, more than 25% of the sample had died within 12 years [245]. Approximately one-half of the deaths were related to tobacco use and one-third were related to alcohol. Smoking and excessive alcohol use are risk factors for cardiovascular and lung diseases and some forms of cancer.
Compared to nonsmoking nondrinkers, the risk for developing mouth and throat cancer is seven times greater for those who use tobacco, six times greater for those who use alcohol, and 300 times greater for those who use both tobacco and alcohol [246]. Both nicotine and alcohol consumption cause the release of dopamine in the nucleus accumbens. Neurobiology may make the combination of the two substances more rewarding than if either substance was taken alone. Certain enzymes in the liver (i.e., microsomal enzymes) convert some of the ingredients found in tar from cigarette smoke into chemicals that can cause cancer [247]. Long-term excessive alcohol consumption may activate these enzymes as well as decrease the body’s ability to respond to infections or abnormal states. Smoking and excessive alcohol use are significant risk factors for cancer of the mouth, throat, and esophagus [246]. A 2000 study revealed that people who smoke, drink alcohol (one or more drinks per day) and develop non-small cell lung cancer had more mutations in the p53 gene when compared to those who smoked only or did not smoke or drink [248]. Mutations in the p53 gene have been seen in smoking- associated tumors and were present more often in alcohol drinkers who smoked cigarettes, than in nondrinkers who smoked cigarettes or in nondrinkers who did not smoke. Seventy-six percent of patients who consumed one or more alcoholic drinks per day and smoked were found to have mutations in the p53 gene. In contrast, 42% of smokers who did not drink (consuming less than one drink per day) had gene mutations [248]. A 2006 study sought to determine how nicotine delivered by tobacco smoke influences alcohol intake. Findings suggest that smoking increases alcohol consumption in at least a subset of smokers [249]. Animal studies have found that chronic nicotine use leads to escalation of alcohol self-administration through a dysregulation in opioid signaling [250; 251]. One of the major barriers to treating tobacco dependence in patients with a co-occurring alcohol use disorder is the notion that it is too difficult to quit both alcohol and tobacco and that attempts to quit tobacco might adversely affect the patient’s recovery from alcoholism [252; 253]. Treatment facilities often concentrate on the “primary” addiction to alcohol and treat tobacco use as a more benign addiction. Fewer than 1 in 10 treatment facilities ban tobacco use on their grounds and many treatment facilities do not screen for or treat tobacco dependence [254]. Moreover, many treatment facilities enable patient smoking by adjourning meetings for “smoke breaks” and allowing staff to smoke openly with patients [255]. In fact, studies show that quitting smoking does not cause abstinent alcoholics to relapse and may actually decrease the likelihood of relapse [256]. Further, quitting smoking has been found to facilitate drinking cessation among tobacco and alcohol co-users [257].
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MDMI1826
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