From the DSM IV ("Diagnostic and Statistical Manual, Volume IV", the manual psychologists use to diagnose psychological problems) - these are the criteria which a psychologist would use to determine whether a patient has alcohol problems:
Definition: A maladaptive pattern of drinking, leading to clinically significant impairment or distress, as manifested by at least one of the following occurring within a 12-month period:
Recurrent use of alcohol resulting in a failure to fulfill major role obligations at work, school, or home (e.g., repeated absences or poor work performance related to alcohol use; alcohol-related absences, suspensions, or expulsions from school; neglect of children or household)
Recurrent alcohol use in situations in which it is physically hazardous (e.g., driving an automobile or operating a machine when impaired by alcohol use)
Recurrent alcohol-related legal problems (e.g., arrests for alcohol-related disorderly conduct)
Continued alcohol use despite having persistent or recurrent social or interpersonal problems caused or exacerbated by the effects of alcohol (e.g., arguments with spouse about consequences of intoxication).
Definition: A maladaptive pattern of drinking, leading to clinically significant impairment or distress, as manifested by three or more of the following occurring at any time in the same 12-month period:
Need for markedly increased amounts of alcohol to achieve intoxication or desired effect; or markedly diminished effect with continued use of the same amount of alcohol
The characteristic withdrawal syndrome for alcohol; or drinking (or using a closely related substance) to relieve or avoid withdrawal symptoms
Drinking in larger amounts or over a longer period than intended.
Persistent desire or one or more unsuccessful efforts to cut down or control drinking
Important social, occupational, or recreational activities given up or reduced because of drinking
A great deal of time spent in activities necessary to obtain, to use, or to recover from the effects of drinking
Continued drinking despite knowledge of having a persistent or recurrent physical or psychological problem that is likely to be caused or exacerbated by drinking.
Source: Adapted from American Psychiatric Association (APA). Diagnostic and Statistical Manual of Mental Disorders, 4th Edition, Text Revision. Washington, DC: APA, 2000.
He might abuse alcohol, but he probably isn't dependent. With his mutant ability to resist poisons, he would have to chug bottle after bottle of liquor to be dependent. Beer just won't do it for him.