I would say yes, as long as you can be certain that you'll be clear of any smoke thereby maintaining VMC, which is obviously going to be difficult to do (to say the least) unless you're certain that the smoke is localised, which the ARFOR would need to state obviously, and you're in a very well lit area, ie. over a city, which could help you spot any reduction in visibility early. Don't think you'd be going anywhere if the smoke was spread across the entire area.