If subjected to more intense or UV light, it may have a small deterioration, decay, or discoloration of the wrapper which may may affect the structure. It would be limited to the outer wrapper where exposed though.
In reality, I think it would take quite a bit of time or intense light and I doubt many of us would be able to tell the difference in how it smokes. I don't think normal ambient room light would do much.
I think a bigger concern would be the additional heat generated by direct light and the evaporation or reduction of the oils.
Yeah, I would think the regular swings in temp would be the biggest issue.
"Hate, it has caused a lot of problems in the world, but has not solved one yet."
― Maya Angelou