Despite an entire array of misinformation on this subject, it seems a small quantity of ethanol reduces "all cause" mortality by about 20% to as much as 25% in some studies. In fact, there is probably nothing else one can do that is as effective. Ethanol is very cardio protective. About 1/2 a shot/drink looks to be best, the form of ethanol matters little, although it does seem that red wine in strict moderation extends life the most at about 4.5 years. As always, look out for bias in these studies, as it is very age and behavior dependent.
The NYT's for example, claims that moderate drinking has no health benefits, and that all 2500 previous studies were flawed. Despite the fact that it's quite well known that very modest consumption extends life, and reduces heart disease. Many studies associate alcohol and avoidable diseases such as AIDS, and other risky behavior diseases, for example, which then skews the numbers unfavorably.