You are presented with the quiz "Inhaling and exhaling fumes of burning tobacco causes damage to what, directly?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "smoking causes direct damage to the lungs" and "smoking is the inhalation and exhalation of the fumes of burning tobacco". 

So, what's the best answer to the question?


 

  lungs         