While rat park is fascinating, it's not the only part of the picture by a long way, and his views aren't exactly mainstream even amongst controversial and outspoken drug scientists like Prof Nutt.

I would be very hesitant to call addiction a myth when we can measure it, and measure the relative addictivity of various substances.

Bruce K Alexander has some interesting views and some unteresting data but AFAICT has failed to really prove his case or overthrow the current models.