Quit smoking, gained 30+ kg of weight, was a cardiology patient, high bp, kidney issues, depression, etc. It was horrible. Restarted smoking, lost the kilos in several months, started hiking and biking. Ended up climbing lots of mountains and now practicing endurance sports and alpinism, doing things which were unimaginable 10 years ago. Haven't seen a doctor in years. Still 'pack a day' smoker. Not condoning or recommending, just my story for perspective.