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Updated Background (markdown)
Edits for readability
Minor touchups on smoker-nonsmoker wording
Edited smoker-nonsmoker example
Fixed some typos, further elaborated on some key points
Mostly cleanup, and one more link in Background, to McKenna paper
Trying to find a functional form of footnoting
Significant re-write of Background. KH, MH will want to look at it, and probably JMA
Created Background (markdown)