I honestly think that if you did steroids for a short period, and you did it right, got the stuff to make you grow, got the stuff to counter the estrogens so you don't get tits, cycled it and got the stuff to restart your hormones afterwards, it probably wouldn't be detrimental to your health.
But let's say you're not one the guys who get nasty sideeffects, and you don't mess up or someone sells you the wrong stuff, there you are, 6 months later, with a big beefy body. And you quit the roids.
Then you go to the gym. Your workout feels weak. You don't get pump. It's really hard work suddenly. You don't see progress (and you're probably really hooked on progress by now), you might even see a setback. All it takes to fix that is get some of the good stuff from that guy, and then load up the syringe and start shooting again.
Next thing you know, you've been on the stuff for youars, you're 250 pounds of lean muscle, way larger than you ever intended, and everyone knows you're a roid user just by looking at you. And that's seriously uncool.
Then one day you're going to be like my sister's bf, 37 years old, not using anymore but still big as a truck, but he feels weak and hates weight lifting because of it. He still has to lift weights though, because all that muscle just falls to pieces and leaves him looking like crap if he doesn't. He has bad back pains from pushing his body so far for so long. He can't fit any regular clothing. He has to watch what he eats a lot, he has to maintain that muscle but don't want to get fat (a battle he seems to be losing atm).
Whatever the internal damage he's done to himself on top of that I don't know, he's still young who knows what will pop up over the years.
I love progress too much, I hate it too much coming back to the weights after a break and being weaker, to ever dare go within an inch of steroids.
Steroids are dangerous long term, even if you avoid sideeffects they still mess your body up, and there's a very big psychological addiction factor to deal with. If you think you can control it, how many roid wrecks do you think started out saying that?