Did he have an innate predisposition to react differently?
There is not thought to be a single cause of substance abuse, though scientists are as of 2004 increasingly convinced that certain people possess a genetic predisposition which can affect the development of addictive behaviors.
Some theories about the causes of autism look to environmental factors while others focus on genetics as the source of the developmental disorders, and others see a possible combination of genetic predisposition and environmental triggers.
Daily Stress: Stress at home, at work, or other mental fatigue, including medical conditions, the death of a loved one, or financial strain can also trigger sleepwalking, especially if the individual has a genetic predisposition for it.
Its over-supply is, however, a frequent cause of predisposition to the attacks of parasitic Fungie.g.