Some people, the first time they try Heroin, throw up and don't really enjoy it (I loved it the first time, actually I loved the entire Universe).
If they continue using, this changes... and if they take it continuously for 10 days, a habit develops which eventually turns into addiction.
I got addicted (psychologically) from the first day, never stopped it for years... but I am not an average case.
Heroin destroyed my life more than anything else.
It is playing with fire, literally.
If you're planning to CTB, then OK... but if you plan to live, getting hooked on H is the single worst thing you can do.
And it is not easy to just "use occasionally"... you think you can control it, but it really controls you.
It is merciless.
Eventually, you end up paying just to feel normal, like paying for your oxygen.
It is worth it only in the first two weeks. Only.
After the initial 2 weeks, it becomes a nightmare.