The fact that he didn’t realize he’s not addicted until stranded suggests that few Jem’hadar ever personally experience withdrawal. They receive regular doses and then die in combat, so it rarely comes up. Almost everything they know about the effect of white withdrawal is received knowledge.
If it weren’t canon that they need white to survive, then my headcanon would be that that they could totally survive without it and they’ve just been lied to all along. Like that episode of TNG.
Strips cut through forested areas like this are generally called fire breaks. I don’t know if there’s a more specific term for those beneath power lines.