The line about Chase's smoking habit is really no big deal. The things kids hear in rap lyrics or see on WWE is far worse. Besides, Chase definately seems like the type who at least "tried" a joint a few times, and inhaled.
I'm still positive on Whedon. He's unfortunately chosen to plunk Chase in a limited status quo of the past vs. evolve him further, but he gets the tone of the rest right and is writing a decent adventure for the rest of the kids. The biggest issue is by the time he catches his stride, the run is over. He's already at the midway point.
But among a short list of "A-List" writers, he's the one who I'd trust the most with the property.
McKeever could probably be solid to follow, though, if he was available. And, good lord, would it be awesome if Vaughan returned. I'm not holding my breath, though. He has his Vertigo works for comic stuff and is making TV money now.