Never, they don't have the coordination. Kidding aside, I would posit that the brain alterations that the different addictions produce leads to the different perceptions of reality that keep winos a little more grounded in the rational world where they won't risk as much to get their drug. In short they don't need it as bad. Probably not a provable assertion (certainly not provable by me), but observation seems to support it.
But a convenient assertion, so you'll assert it anyway. Got it.
but observation seems to support it.
What "observation"?