6afb5300_usation___HealthNewsReview_org__Study_design
Ever-use of alcohol over the past 20 years was associated with a 1.3-fold increased risk of breast cancer drinking alcohol at any time in the previous 20 years increased breast cancer risk 30 percent [Problem] Increased was converted into an active, causal verb, though researchers had used it as an adjective in a noncausal statement [Suggested language] But readers shouldn’t jump to the conclusion that alcohol use increases breast cancer risk. That’s a conclusion that such an observational study cant reach. Other factors in the women’s lives may have accounted for the risk. Only a randomized clinical trial can establish a cause. [Study design] 
Case-control study of alcohol use and risk of breast cancer (observational)
Observational Studies - Does The Language Fit The Evidence? - Association Versus Causation - HealthNewsReview.org
Study design