I like to think of addiction as a mental illness. Whether you have a "Preexisting" condition or it comes to light while under the influence of drugs. It boils down to the chicken or the egg in my opinion. The whole powerless over drugs thing in my mind is a crock of shit. I'd know I attend meetings regularly. They say addiction/alcoholism is a disease, I just take things one step further and call it a mental disease where "most" people in the rooms wouldn't consider it a mental illness.
IMO cocaine causes Schizophrenia. Just as weed can trigger psychotic episodes in about 10% of population. Instead of citing some random numbers I'll post a valid study. See table of contents and go to section two 2. marijuana and psychosis
http://toronto.cmha.ca/files/2012/09/trellis_marijuana_psychosis_booklet.pdf
Keep in mind stats can be swayed in one direction or the other depending on your outlook.
For those of you that might try to "Come at me" just know that I've had enough first hand experience, and see shit happen to my friends to be able to talk about the dark train.
I have over 7 years clean, and it's only worth today. Right now I'm in a hotel beside a casino, and could go out, and find something to use in the matter of minutes. Only a fraction of addicts/alcoholics make it. The point is some do, while others don't. If you were to look at the numbers in the homeless community, and the correlation of people with Schizophrenia, and other disorders the numbers are staggering. Same could be said about jails.
I don't care if you're pro-drug or anti-drug. My advice to anyone who thinks they have a problem is go seek out help. I don't think becoming a medicated zombie is the answer either, but what I can say is when you stop using drugs the peaks & valleys mellow out to an even keel, and life can become manageable.