Could be a small glitch, try rebooting and having another look, thing is, the smoke is from the same source with virtually everything, a cabin, you see smoke from one type of cabin, brad uses that cabin by reducing it's size till it's tiny, but the smoke stays the same, he then sticks it in a chimney stack of a non smoker and hey presto, more smoke than you ever saw, but it's all the same, so if one works it would be odd if others didn't.
The only thing I am uncertain about, is just how many smoke sources there are.