... to conduct further studies to establish whether or not there was a causal relationship. As stated in the Warning Label Fact Sheet for the US Public Health Service, scientific evidence was found that showed the usage of tobacco does indeed cause many side effects, such as cancer, addiction, and serious health problems. These conclusions may not have been able to be obtained from the correlational studies, but they were obtained from studies that stemmed from the implications and predictions of the correlational studies. Sir Francis Galton, a cousin of Charles Darwin, conducted one of the earlier correlational studies in 1889. Studying variability in humans, Galton conducted a correlational study of the height of children against their "mid-parent" height - this being the average height for both parents allowing for the mean difference between sexes. Galton concluded that taller parents generally do have taller offspring. However, even though there may be ...

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