Think of well-known musicians such as Kurt Cobain, Jimi Hendrix, and Jim Morrison, who died way too young from addiction-related causes. Then there are writers, like Samuel Taylor Coleridge, Edgar Allan Poe, and Earnest Hemingway. The “Master of Horror,” Stephen King, lived through alcoholism but is sober today: King is the author of 65 novels and approximately 200 short stories (and writing!)
An "enabler" is a person who encourages or allows self-destructive behaviour in another. That means any habit that's detrimental to the person and usually those around them too.
Through exhaustive research, psychologists are slowly discovering the reasons and triggers which cause substance abuse and addiction. Research tells us that biological and experiential factors trigger addiction.