Most addicts use language like that because trying it once was the mistake that led them to full blown addiction. Generally, the first time is what they consider the mistake because without it, there wouldn’t be a second time. Someone near and dear to me, who battled their way back from heroin addiction described it like this:
That first heroin high is so indescribable, so beautiful, that you become desperate to seek that feeling out again. Heroin becomes the devil promising you, just one more time, we’ll get there again. Meanwhile, your body is building up the need to have it. Without it you feel physically sicker than you’ve ever felt in your life, and the devil is telling your brain, just one more time. You’ll feel better. So you get more and more desperate for that just one more time. You’d sell your grandma’s soul for one more time.
It’s not that they tried it once and walked away. It’s just that first time was the mistake that led to more.
It’s hard for me to understand because, well, I’ve never tried it, nor do I intend to. But every addict I’ve known, when they’re being honest, they use very similar language.