Read the following context and choose the best option to answer the question.
Context: There was always wine and always , always cigarettes . It was your responsibility as a child not to get burned by your mom 's cigarette . Not to run up and hug her from behind without making sure first that there was no cigarette . You had to be alert if you stood too close , ready for a conversational gesture that might bring the lit cigarette flying towards your arm or face .
Question: What may be the reason why people smoked so much back then ?
Options: 
- They thought that they needed to smoke if they were a parent .
 - None of the above choices .
 - They did n't know of the health risks associated with smoking .
 - They did n't care about the health risks .


They did n't know of the health risks associated with smoking .