2.How cigarette smoke trouble the aging of lung cells, through oxidative stress, casue COPD progression., Can you explain more details of oxidative stress in precise stentece ....as well tahnks so...

2.How cigarette smoke trouble the aging of lung cells, through oxidative stress, casue COPD progression., Can you explain more details of  oxidative stress in precise stentece ....as well tahnks so much

3. Hepatic congestion and peripheral oedema happen due towhat kind of
bloodcannot enter the lungs and so returns to the venous system, .....