It is not a habit, I assure
I always take a deep breath all of a sudden
Whenever I feel slight breathless
Probably linked to my childhood health history
& after that I feel better

But just now
When I took a deep breath
My chest hurts
My deep breathing halted
OUCH!
Suffocating
I quickly gasped several short breathes to occupy my lung capacity
I rested for a while
& took another deep one
I hurts again
Damn

I stopped
Then my heart ached
It cramped

Shucks