What point is your analogy even trying to make? “If you want to be healthy and still do crack or heroin, you just need to do less crack or heroin”? Dude, you sound batshit. Is this ragebait?

Which while true some people do not have the ability to follow through on.

No, it’s not even true. Some people have medical and/or genetic conditions that make losing wait nearly impossible even if they eat absolutely healthy, in moderate amounts, and exercise regularly. And unless you’re a medical doctor I suggest you shut the fuck up and stop being so smug while spreading outright falsehoods as if they were fact.

but I wager the people willing to do heroin or crack are the kind of people most likely to get addicted to it.

No, many of them are the type of people who get a back injury at work and are prescribed too many painkillers (often by doctors who receive financial kickbacks from pharmaceutical companies who manufacture opioids), only to get addicted to these highly physiologically addictive substances, so that when the prescription runs out they experience withdrawal symptoms which are literally torturous to endure unless they can find a fix on the streets, where heroin and fentanyl are easier to come by (and cheaper) than Vicodin or Percocets.

Addiction is super fucked up but it’s not some sort of alien body snatcher that makes you have zero control of your actions.

This whole sentence is fucked, and it just goes to show you have no personal experience in the matter and no clue what you’re fucking talking about. And if there’s anyone in your life who’s struggling with addiction, I feel sincerely sorry for them that (in addition to the living hell they’re already going through every single day) they have to deal with you, your judgement, and your dismissiveness.