Well, unfortunately smoke has affected my trips for each of the last four years, including a trip I did to the Wind River Range in Wyoming 4 years ago. 2014 and 2013 there were really bad fires affecting me in the Sierra Nevada. When the gigantic Rim Fire burned in Yosemite, I actually changed my route to a trailhead 60 miles south, it was that bad. Last summer when I did the JMT, I really couldn't change my route, and unfortunately I had some very smokey days But I still had a great time on all my trips overall. Long distance views can be hazy, but usually it's clearer in the mornings at least. I'm a big believer in changing my itinerary if I think it's necessary, so one thought is to have a plan B. For eg, if it seems like it will be clearer to the south, say in Teton or the Winds, go there instead. Still going to have fantastic scenery. Good luck and have fun.