Many of the current homeless within, say, the U.S. would have come of age following "Just Say No", the War on (some) Drugs, and DARE programmes. Casual survey

Many of the current homeless within, say, the U.S. would have come of age following "Just Say No", the War on (some) Drugs, and DARE programmes. Casual survey would say effectiveness was limited. If you're looking for a policy angle, I'd suggest one more conducive to providing more housing and stable incomes.