I really can't imagine being that self-destructive.
I am. Well, I was. (I take my life back, slowly) What you write is true. Abusing drugs is like becoming another person. You do things you never thought you could do. First, someone dependent lives only for his drugs. How to find the next dose? Where to find it? What to do for money? And once you have found, it's the same questions again and again.
Then comes what we can call ''the game''. How to hide your condition? How to hide drugs? You become more skilled over time. At first, you hide your substances under your pillow but once people discovered the place you hide drugs in remote or in a flashlight etc.. As Amy who has already hidden the cocaine in the hose from her bath to prevent Mitch discovers the truth.
After, the physical. Throat burns after smoking heroin ? Mister Freeze. You have cracks on your face due to crystal meth ?Makeup ! And so on. All this to explain that, as you said, taking drugs is learning to manipulate anyone around and especially yourself. Once you're hooked, you're not the person of the past and the first reflex when the physical effects appear, is not to change behavior but to change reality and find any trick to hide negative effects of the drug.
It's a disease so powerful and it takes up so much space in your mind. It controls everything.
Everything. So you end up by let it destroy you and even help it grow. It's an illusion that Amy and all addicts have in common. Why stop if there will always be something to hide the truth, you know ?
Sorry for my English. Enough blabla...it's time for pictures.