Is it normal that I feel chest pain when I take a deep breath in? what could it be? will it go away?

I've only just noticed this, but when I take a deep breathe in I will feel a bit of pain and will cough... I am a smoker, but I do exercise a decent amount every week and eat well.

I am not a heavy smoker though.

What is it? is it anything serious?
Is it normal that I feel chest pain when I take a deep breath in? what could it be? will it go away?
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