answer: #Person1# describes to Bob the definition of thirdhand smoke. Dangerous matters will get into hair and clothing when people smoke, so parents should quit smoking.
documents: #Person1#: Bob, I'm sure you know about secondhand smoke.
  #Person2#: Of course, I do.
  #Person1#: But have you heard about thirdhand smoke?
  #Person2#: Third hand smoke? I'm afraid not. What is it then?
  #Person1#: Well, it's here in today's paper. Parents may think they are protecting children from secondhand smoke when they smoke outside their home or only when the children are not there. But now researchers are warning about what they call third hand smoke. When you smoke dangerous matter from cigarettes gets into your hair and clothing. As babies are the weakest when you come to a baby. You pass it to the baby and increase the chances of disease in the baby.
  #Person2#: Is that so? In that case. I have to say that I should never get close to a baby.
  #Person1#: That's right. Actually, all smoking parents should do the same or better give it up completely.