A major increase in cigarette taxes occurs during a one-year follow-up study of the impact of a smoking cessation program. Identify the main threat to internal validity (History, Instrumentation, Maturation, Mortality, Selection Bias, or Testing).
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Home » Social Studies » A major increase in cigarette taxes occurs during a one-year follow-up study of the impact of a smoking cessation program. Identify the main threat to internal validity (History, Instrumentation, Maturation, Mortality, Selection Bias, or Testing).