You can, with sufficient motivation. The problem is people with that kind of motivation tend not to become junkies in the first place.
There is a whole lot of information out there, for free and easily discoverable. If you're really interested in holding an opinion, I'd start at your favorite search engine.
Have you heard the phrase, "Dry drunk?" That is a good reference point. A dry drunk is a colloquialism for someone who doesn't drink but still exhibits the behaviors associated with an alcoholic. This is because the brain chemistry has changed.
An addict can, sometimes, learn to use in moderation - but the addiction remains. The brain chemistry remains forever altered. There has been huge efforts made in researching this. The science is fairly mature and the results are fairly well understood.
Addiction doesn't just go away. Physical dependence may go away, though that depends on the treatment and many other things. There is a difference between drug use, physical dependence, and addiction.
makes me wonder what kind of crazy bubble you grew up in. what a strange belief to have.
Did you grow up in a bubble where that never happens? What a depressing bubble.
That doesn't mean that it is not an illness.
More accurately, often addicts attempt to do so, but the vast majority who do so relapse.
But, in any case, not using drugs doesn't mean you stop having an addiction anymore than avoiding contact with bees means you stop having an allergy to their sting.
And the fact that some manage does not mean that all of them could.