Addiction to alcohol is also a neurological phenomenon, the result of a complex set of molecular alterations that take place in the brain when it’s excessively and repeatedly exposed to the drug.*11 The science of addiction is complicated, but the basic idea is fairly straightforward: alcohol appears to wreak havoc on the brain’s natural systems of craving and reward, compromising the functioning of the various neurotransmitters and proteins that create feelings of well-being.