I have been away on my holliers (in Algarve) and so am coming back to this topic a little late. As I tweeted to the Irish Cancer Society at the time (just before I left); Alcohol is NOT listed as a carcinogen. I deal with Safety Data Sheets (SDS) every working day and the one for alcohol (ethanol) does not list it as being a carcinogen or even as a suspected carcinogen. That is a fact of the matter. Where the ICS are probably getting confused about are the following 2 points;
1. Acetaldehyde is a carcinogen, and is a by-product of ethanol when broken down in the body - that's one of the reasons for a hangover (along with dehydration). But as I understand it - that happens from drinking to excess.
2. Alcohol (especially when taken in high ABV form e.g. spirits) can lead to sensitisation of the throat area and increases the risk of developing throat cancer for those who smoke.
Alcohol is NOT carcinogenic!