Not only does this line up squarely with my own personal experience with addiction and other psychosis I have, but the lack of these issues in my children as well, who had a radically different early childhood then I and have no addiction issues whatsoever.
Case in point...I recently saw the documentary about the triplets that were separated at birth and given to 3 different socio-economic and emotionally-connected parents and who, by total accident, met at college and came to be national celebrities in the 70's and 80's.
One of the three eventually killed himself, due in part I'm sure to his much deeper addiction issues then that of his 2 siblings. The interesting part was that he was given to the "wealthy, but emotionally distant" family.
By far the most well balanced and successful of the 3 was the one given to the gregarious and emotionally-connected father, who showered the child with love and support throughout his whole life.
I could go on for 30 minutes discussing all the takeaways of this documentary, called Three Identical Strangers...it turns out the children where all part of an ethically-questionable experiment where, in my mind at least, the end results basically proves that 95% of the nature/nurture argument goes to the "nature" side.
It seems that all "nurture" can do is fuck you up and give you lifelong issues that are incredibly difficult to overcome.