My understanding is that the Rat Park experiment couldn't be replicated, and is now not taken very seriously: https://theoutline.com/post/2205/this-38-year-old

My understanding is that the Rat Park experiment couldn't be replicated, and is now not taken very seriously: https://theoutline.com/post/2205/this-38-year-old-study-is-still-spreading-bad-ideas-about-addiction https://theoutline.com/post/2205/this-38-year-old-study-is-s... And Johann Hari is universally understood to be an incorrigible charlatan.