There has been a widespread debate whether addiction is caused by the drugs themselves or some other factor. Psychology Today has an article that simply states the view point on "addictive personality".
http://www.psychologytoday.com/blog/look-it-way/200903/the-addictive-personality"

People across many societies and cultures can become addicted to alcohol, marijuana and other drugs. Is this addiction caused by their "addictive personality" or some other factor? According to Stephen Mason an author of Psychology Today, "addiction depends, first and foremost, upon having an addictive personality." Our society tends to believe that drugs are, all by themselves, addicting. Yet there are many people who can drink a few glasses of wine at dinner or who have smoked marijuana a few times and have not become addicted. Doesn't this fact, in and of itself, disprove our society's belief that drugs are addicting by themselves? Yes it does! Being addicted to something is merely an "out-of-control habit"; someone who wants to get that good feeling all the time and organizes there life around it. This means becoming absorbed in a task such as drinking, gambling, going to church or any other task that brings about good feelings for someone.
People with this "addictive personality",10%-15% of the population, simply don't know when to stop. This can refer to almost anything: drinking, smoking, going to church, or gambling. Stephen Mason brings up a common phrase that we have all heard of from our educators, peers, parents, and the media, "too much of a good thing can be bad." The people with this "addictive personality" are very good examples of this saying.
Here is a video that briefly explains "addictive personality":
http://www.youtube.com/watch?v=85HM4b1cAsM
I agree with the many scientists that believe people can become easily addicted if they have an "addictive personality", yet there is proof that supports genetic influences on addiction as well. This being said, one cannot forget about other factors that can influence addiction and the other theories out there besides the "addictive personality" theory.
One more link that I would like to provide for this blog post includes a song written and performed by Rob Bryanton. This song explains a lot about the "addictive personality" and its possible causes.
http://imaginingthetenthdimension.blogspot.com/2008/02/song-10-of-26-addictive-personality.html
This song supports the idea of "addictive personality" but it also brings up questions of how this "addictive personality" came about. It could be from nature, nurture, media, or genes. All these things influence individuals, even their ability to become addicted to a certain drug or action.
