grand canyon hlt555 week 2 and 3 discussions latest 2015

wek 2Why are studies on the health effects of smoking among individual who smoke not a concern of environmental epidemiology? Explain the reason why exposure to secondhand cigarette smoke is a concern of this discipline.diss 2Explain why you and your classmates may have a different response to the same exposure to a chemical. Provide a specific example.week 3What are some examples of environmental sources of exposure of populations to toxic heavy metals? What factors can exacerbate the effects of toxic exposures on populations with low socioeconomic status?diss 2What types of injury of public health concern are associated with exposure to each of the different forms of radiation? How does the risk of each injury vary with the dose of the radiation in question?