[toasterlovin]

Nobody wants to hear that there are some people who are just not equipped for an environment A) with abundant access to addictive substances and B) where economic success is dependent on being reasonably intelligent and able to delay gratification.

[Nomentatus]

Epigenetic damage can undoubtedly predispose one to addiction, etc. But bad health in general can get you unhoused, and there's an epidemic of chronic illness. Delaying gratification and a good IQ aren't sufficient to pave your way in the world.