Also, that whole industry of powerlessness behind drug addiction is absolute fucking poison. They keep everyone addicted by lying to them.
The bottom line is you're the complete opposite of powerless, and beating yourself up and saying you're a fucking addict for life and removing all personal responsibility is the worst thing anyone can possibly do.
It's not in anyone else's hands but yours whether you decide to wake up and live a better life where you're not slave to your demons. Anyone can do it, and like most things, you have to endure some pain and hardship to reap the benefits of far greater things.
The medical industry needs to stop giving people excuses like "you're predisposed to being a fat fuck" or "you're genetically likely to be a junkie or a drunk". None of that shit matters. All that matters is that you have willpower and a reason to live a better life. Literally anyone CAN do it. The question is how much do you want to?