Why haven't we solved the addiction crisis?

Kenneth Blum, Abdalla Bowirrat, Luis Llanos Gomez, B. William Downs, Debasis Bagchi, Debmalya Barh, Edward J. Modestino, David Baron, Thomas McLaughlin, Panayotis Thanos, Mauro Ceccanti, Igor Elman, Rajendra D. Badgaiyan, Catherine Dennen, Ashim Gupta, Eric R. Braverman, Mark S. Gold