Could there be selection bias? Stupid example theory: Habitual coffee drinkers do so because they have to wake up every morning to go to work, which is a popula

Could there be selection bias? Stupid example theory: Habitual coffee drinkers do so because they have to wake up every morning to go to work, which is a population group that has a steady income and life, does not abuse substances and has access to healthcare. All factors that increase the length of life.