Does breathing easier after exercise mean it's probably not lung cancer?

I've been worried cause I seem to get really winded quickly when I sing now but I seem to breathe easier after I exercise.

I definitely have allergies that make it more difficult to breathe through my nose but I feel like its not just my nose anymore but my lungs just have less capacity (breathing through mouth feels better but still like I take in less air). i seem to breathe a tiny bit easier when I'm lying on my back too.

Do you guys think I can rule out lung cancer?
 
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