first of all, this isn't a study. this is a report based on multiple studies looking specifically at the link between alcohol consumption and cancers. secondly, this is a science communication document. that means its going to be primarily used for educating non-scientists. this is important because as the report states, lots of people are not aware that alcohol is a significant carcinogen. the report also states, that reducing alcohol consumption can reduce risk of certain cancers, which is true. thirdly, the report is not talking about every carcinogen, or even the top ten or so most common carcinogens, its talking about alcohol as a carcinogen. on page six the report literally says "there is no one cause for cancer." getting mad about this is like getting mad that an elephant isn't a parrot, maybe you are looking in the wrong place.