This video is pretty much spot on, missing a few details but the general message is correct. If you want more information on this topic, this doctor goes deeper into what causes that % of the population to be susceptible to addictions of all kinds.
https://www.youtube.com/watch?v=T5sOh4gKPIg
More useful clips by Dr Gabor Maté:
https://www.youtube.com/results?sear...mate+addiction