Maybe not genetics, however there is something to be said for blaming the parents. With an alcoholic father you may have developed a slight bit of 'co-dependency' growing up, leading to things like wanting to find comfort in weed and going the extra mile to make your employers happy. As a society we are not well educated about personality disorders (which exist on a scale) and how these develop in childhood with resulting addiction related issues. The general debate on drugs is naive because we do not understand these underlying causes.