Would be interesting to see the rate of Alzheimer's among addicts and former addicts. But I imagine the sets "IV drug users who share needles" and "people who l

Would be interesting to see the rate of Alzheimer's among addicts and former addicts. But I imagine the sets "IV drug users who share needles" and "people who live to be old enough to be at risk for dementia" don't really intersect in any meaningful way.