Using any metal that is galvanized with a heat source can lead to zinc toxicosis, True smoking at very low temps this would be unlikely, but for BBQ I would be very concerned. This topic has been discussed for years on some of the BBQ forums and can be quite contentious. I personally would not use it.
I've seen that too. Yeah, most definitely for low temps when you're in no hurry, and definitely not as a grill!