Express your stance on personal freedom and the issue of addiction.
If it's none of our "damn business what people smoke or eat", neither is it any of our damn business where people sleep or don't sleep, live or don't live...
Addiction has little to do with "misery". Successful people - people who have achieved all of their life goals - may still find alcohol, pot, opiates, whatever irresistible and will sometimes lose everything chasing their addiction.