A map of the Global Burden of Disease (GBD) Project's summary exposure values (SEV) by state for the USA in 2019. The GBD project describe SEV as, "A measure of a population’s exposure to a risk factor that takes into account the extent of exposure by risk level and the severity of that risk’s contribution to disease burden. SEV takes the value zero when no excess risk for a population exists and the value one when the population is at the highest level of risk; we report SEV on a scale from 0% to 100% to emphasize that it is risk-weighted prevalence."