Excessive gambling among victims of Parkinson's disease can now be linked to one of the most popular drugs used to treat the malady. In fact, a number of excessive behaviors, like sex and shopping, can also be attributed to the drug Mirapex among Parkinson's patients.
The article linked above gives a number of "testimonies" of people caught up in virtually unrestrainable urges to excessively gamble (among other excessive behaviors). As soon as they stopped taking the drug, the urge was not as strong. As you might expect, a California attorney is filing a class action lawsuit against the drug company.
This is an amazing drug. What the study did not indicate (at least the article citing it) was whether any of these people ever had any excessive impulses before the drug. A biblical evaluation would suggest that the impulse has always resided within. The behavior was no doubt already a part of their lives. Perhaps the drug so affected these people that their will to be self-controlled simply succumbed to the already residing desire to sin.
Jesus said, "That which proceeds out of the man, that is what defiles the man. For from within, out of the heart of men, proceed the evil thoughts, fornications, thefts, murders, adulteries, deeds of coveting and wickedness, as well as deceit, sensuality, envy, slander, pride and foolishness. All these evil things proceed from within and defile the man." [Mark 7:20-23]
According to the popular "course of this world," it appears that the excessive nature of our American behavior can never be a result of indwelling sin. In other words, we must find any means possible to deflect the guilt that comes from sin away from ourselves, creating some answer that will explain why we are not at fault. Wow, another testimony to the truth of God's word regarding the human heart (Jeremiah 17:9-10).