Why does it take so long for an individual to recover from drug or alcohol addiction?

It’s so easy and fast for them to get addicted and yet it takes such a long time to get over the attachment to the drug/alcohol. Why is this so?

What does it take to get over drug or alcohol addiction?

I know that it involves more than just staying away from drugs or alcohol. What else does a person have to do?

How long does it take for a drug and alcohol rehabilitation program to last?

I want to undergo a drug and alcohol rehabilitation program. I want to start over with my life and I think allowing myself to be sober and detoxified is my first step to recovery. I’m worried about the time, though. I want to know how long the program will last because I want to be [...]