My last few years have been spent in high humidity and high heat areas, Louisiana and now Mississippi. When the humidity gets way up there I usually find myself having to touch up the burn on my smokes. They don't really burn unevenly, it's just that taking them from 65% humidity to 85%+, the wrapper starts absorbing some of that moisture in the air and that slows the burn. So I have to make a choice: smoke faster, thus keeping it burning well while at the same time degrading the quality of the smoke, or occasional hits with the torch to keep the wrapper going the way it should. I choose the latter.
This is the precise reason I've told my wife that in our retirement home I'll have a room inside the house in which I can smoke.