The best single behavioral change americans can make to reduce morbidity and mortality is to

Stop smoking.

Explanation:

According to analysis, it is deduced that smokers tend to die 10 years earlier than non smokers.

The estimation of population attributable fraction the percentage of the disease morbidity or mortality that is attributable to an exposure is central to calculating burden. The calculation of PAF for a particular risk factor represents a form of quantitative risk assessment. Risk assessment is a systematic approach that translates research findings for the purpose of guiding the implementation and evaluation of public health programs etc.