I like the smell of Pyro. Always been a fan of anything that burns and firworks etc. I love flares at foreign games too but sadly I know why they won't let us have them. Some fans in other countries where they're either allowed them or not stopped are quite sensible, they use them pass them forward and drop them into the gravel.
The smokes seem to disperse pretty quickly so shouldn't cause too much of a problem. People will think anything makes them cough that is smoke even if it isn't doing, always been the same when drama people use a smoke machine which has no effect on breathing people start coughing.