First, observational studies can have control. Like perspective cohort study (people choosing to smoke versus people choosing not to), case-control (people with outcome versus people without outcome.) A more proper contrast for observational studies is probably "intervention studies" or "experimental studies," in which researchers get to assign exposures.

Back to your question. Most epidemiology journals do publish intervention studies such as clinical trials (ex1, ex2, ex3, ex4), although it's true that they are rarer than observational designs. Most epidemiology courses and texts also include intervention study designs like clinical trials.

First, observational studies can have control. Like prospective cohort studies (people choosing to smoke versus people choosing not to) or case-control studies (people with outcome versus people without outcome.) A more proper contrast for observational studies is probably "intervention studies" or "experimental studies", in which researchers get to assign exposures.

Back to your question. Most epidemiology journals do publish intervention studies such as clinical randomized controlled trials (RCTs; ex1, ex2, ex3, ex4), although it's true that they are rarer than observational designs. Most epidemiology courses and texts also include intervention study designs like clinical randomized controlled trials.