Yoga Breathing is about finding and benefitting from the power it gives.
Seven years ago I started with very high blood pressure, diabetes (type2) and a lot of body fat.
I now have Ok BP, I’m no longer diabetic, lost four stones (64lbs or 30kg) and after 55 years of not singing, I have a voice in the operatic range. I literally went from zero to Nessun Dorma.
Once you realise how little you are able to process oxygen as a smoker you understand how much of your life your wasting giving up your own life-power to an expensive plant.
You could meditate on the rich individuals laughing at you kill yourself for their profit.
I hope that helps.