I don't know where to begin to point out the philosophical presumptions here. If you agree with me that ethics are subjective, then you must concede that you were erroneous in saying that drug addiction leads to unethical behavior. If you do not agree with me that ethics are subjective and contend that they are in fact objective, you would then be challanged to display this glorious, universal set of ethics for all of humanity to look upon and love. Let's look at the good ole dogma. A regular drug user is a drug addict because the repeated drug use is compulsive behavior.
Compulsive behavior is brought on by drug addiction.
Compulsive behavior includes regular drug use. Okay, so first, our Indicator will indicate when a person is behaving in a healthy way. I'm not an alcoholic or other drug addict. I got lucky. I don't know where to begin to point out the philosophical presumptions here.