[ConservingFreedom]

Here's what the American Society of Addiction Medicine says:

“Genetic factors account for about half of the likelihood that an individual will develop addiction.

So you're point is

My point is that you're wrong to keep claiming that addiction is a purely physiological phenomenon.

that losing HALF of our population is acceptable?

No, "half of the likelihood" does not translate to "HALF of our population."

[DiogenesLamp]

My point is that you're wrong to keep claiming that addiction is a purely physiological phenomenon.

Your OWN statement indicates this is true for HALF. Pointing out that it might not be true for the other half is just an effort to dodge the salient point.

What percentage of our population do you regard as an acceptable loss?

No, "half of the likelihood" does not translate to "HALF of our population."

Whatever it translates too, it represents a significant number of casualties. What percentage of our population do you regard as an acceptable loss?