a lung is a kind of internal organ & internal organs are a part of the body ->  lungs are a part of the body  lungs are a part of the body & if something harms something else, then that something also harms the parts of that something else ->  if something harms the body, then that something also harms the lungs  if something harms the body, then that something also harms the lungs & smoking is a kind of method for inhaling smoke0 ->  smoking harms the lungs  smoking harms the lungs & smoking is a kind of method for inhaling smoke ->  inhaling smoke by smoking harms the lungs  harming something has a negative impact on / effect on that something & damage has a negative impact on a thing ->  damage can mean harm  inhaling smoke by smoking harms the lungs & damage can mean harm ->  inhaling smoke by smoking causes damage to the lungs  smoking is a kind of method for inhaling smoke2 & when a lung breathes in air the air goes directly to the lungs ->  a lung is a kind of organ for directly breathing in air  a lung is a kind of organ for directly breathing in air & smoking is a kind of method for inhaling smoke1 ->  a lung is a kind of organ for directly breathing in gasses  a lung is a kind of organ for directly breathing in gasses & smoke is a kind of gas ->  lungs can be used for directly breathing in smoke  lungs can be used for directly breathing in smoke & to inhale means to breathe in -> lungs are a part of the body0: lungs can be used for directly inhaling smoke  lungs are a part of the body0 & inhaling smoke by smoking causes damage to the lungs -> smoking causes direct damage to the lungs