Read other posts as well you lemming 
taking something to get more energy. then something to help with sleep. when body starts to hurt take painkillers. and being used to use needles they might be more open to inject other substances. side effects from steroid use, for some, may be depression etc so they may take something to battle that.
list goes on.
I agree with Stark here. Don't anybody faint!
He never said it WOULD, he said it COULD.
Steroids = increased strength, increased danger to connective tissue. Injury, in the rright person, could lead to use, overuse, and eventual abuse, of painkillers, narcotics, Nubain etc...
This is in no way an indictment of the drug itself. I do think that in the hands of an obsessive/addictive personality, the inability to let go of gains long enough to let an injury heal could open a doorway that leads to narcotics abuse.
Many people smoke pot once, snort one line, take one shot...whatever, than never do so again. Many others hit something once, and they're hooked. I smoked week once in college. All I got out of it was uncontrollable laughter and the desire to eat everything in sight. In face, I ended up cross-legged in the kitchen floor in front of my friend's fridge, cleaning it out! I didn't like it and never did it again. someone else might have gotten hooked. It's a very individual phenomenon.