I grew up in forest fire country, and there's another monster burn right now, right where I planned to backpack in two weeks. Plan B or Plan C or Plan D trips options are therefore in my head, just like every summer. But in modest amounts, smoke can lend wonderful atmospheric depth, just like 19th C blue-sensitive films. A few years ago I had my 4x5 and a long lens pointed at the silhouette of a particularly handsome backcountry pinnacle. We were camped around 10.000 ft above most of the smoke, but it still obscured most distant things visually. So I installed a red filter to cut thru the haze and took the shot. Talk about dumb luck! When I made a big print from the neg, there was a golden eagle in perfect silhouette right on the tip of the pinnacle. I could hardly make out details of the rock itself with the naked eye.