All of the following are long-term risks associated with exposure to secondhand smoke except:
a. increased risk of respiratory illness
b. increased risk of lung cancer
c. change in senses
d. increased risk of cardiovascular disease
in what year were cigarette packages made to include 6 warning labels that mentioned the surgeon general

The answer is D.
Cardiovascular diseases are a result of a sedentary lifestyle and a poor diet. Secondhand smoke is not a risk factor for CV diseases. The other choice except letter D are long term risks associated with exposure to secondhand smoke. A person should stay away from people who are smokers so as not to obtain these possible complications within the body. Air filters in cigarettes are not present in the air which make chemical exposures at a higher level for people who are secondhand smokers compared to smokers themselves.

Alinear relationship would look like a straight line on the graph. it could have a positive negative or 0 slope. so it could be a line potentially going in any direction but it must be perfectly straight.