I'm kind of torn on it. In that I love it (picture posted in match thread), but I also know that, for example, the Celtic Disabled Supporters Club asked the Green Brigade to pack it in, as they've got a number of members with respiratory issues. If its affecting them, then fair enough, logic would suggest that its likely to be similar with Everton supporters.
Worth making the distinction between flares and smoke bombs as well. Flares: Wee bit dangerous due to being, y'know something burning. Smoke bombs, in the main, are pretty safe.