The essential problem with this view is that the mind IS matter. Our minds really just boil down to a series of chemical reactions. Sure, if we were talking about walking on hot coals, it is possible for the mind to block out painful sensations, as all pain is in the mind. However, in the case of drug addiction, the problem is that cravings exist purely in the mental realm. In short, "mind over matter" doesn't really amount to much when it is our brain cells themselves that have become dependent on certain substances. Because of all this, our minds can't even function without these substances in major addictions.
I respect your opinion, sir, and I won't judge you for it. But I've had too much experience with people suffering from addiction, and too much exposure to the science involved in addiction, to get behind such views.