My friends son did his doctorate thesis on Alcohol addiction. Another friends son is at the same uni teaching on smoking addiction. A tendency toward addictive behaviours may well be genetic, or it may well have some 'hereditary' proponent as Eilonnwy says... those things tend to follow, unfairly sometimes due to circumstances (it's be difficult for things to be any other way).
"Twin studies have established that there are substantial genetic influences on alcoholism (0.5-0.6) in both men and women" - http://www.springerlink.com/content/9171gj889742r5wl/
I don't know how you conclude that addiction definitely isn't genetic
"Twin studies have established that there are substantial genetic influences on alcoholism (0.5-0.6) in both men and women" - http://www.springerlink.com/content/9171gj889742r5wl/
I don't know how you conclude that addiction definitely isn't genetic