Eye specialists, general information on eyes, eye exercises, eye diseases, vision
Addiction is the top healthcare problem for the U.S. and Europe.
Addiction is a disease of the brain characterized by a chronic and compulsive need to take a substance, at increasing doses (tolerance) and on more frequent occasions (dependence), even when faced with negative consequences. Compulsive substance abuse can result in chronic and debilitating health problems, family breakdown and social isolation, poverty, incarceration for criminal activity and death.
Tolerance occurs when it takes a higher dose of the drug to get the same effect. Dependence develops when neurons in the brain adapt to the repeated drug exposure and only function in the presence of the drug. When the addictive substance is withdrawn the user experiences withdrawal symptoms that can be extremely uncomfortable and debilitating prompting the user to use again to avoid the withdrawal syndrome.
Eye specialists, general information on eyes, eye exercises, eye diseases, vision