This is a really fascinating thread.
I don't have an issue with alcohol, but have noticed that I have consumed more during stressful periods in my life. I do think that it is habit forming, so first and foremost it is a psychological issue. Or perhaps a learned behaviour that is bolstered by cultural identity and programming (social norms).
What I did want to add though - I have recently been rewatching Midsomer Murders from the first season onwards. A proper Prime binge! And I have noticed how much the Barnaby's drink, it is unfathomable, haha! I realise this is fiction, but if you take moment to think about it, this is a massive cultural obsession (dining with a few bottles for the MC, propping up the bar or drinking alone for the WC).
The working class depictions in media and culture are generally looked upon as either deviant or disastrous, whilst the 'gentle unwindings' of the middles and uppers seem much more acceptable! It is interesting how perceptions such as these persist.
Almost everyone Barbnaby interviews in the course of an investigation pours or offers him a Scotch. and the higher up the social 'ladder' you go it's out and out debauchery; a splash of scotch or soothing sound of a good wine pouring into a crystal goblet sets many a scene.
It's amusing and all in good fun for Midsomer, but in reality this is very much an interesting observation on the whole. We associate drinking with relaxation, socialisation, celebration, and just general moment to moment living. And if it is presented in a refined or higher status setting, it is even more insidious. How many of us identify our drinking with Waynetta slob as opposed to Joyce Barnaby? We will of course identify with Joyce, so it's all ok 
Socially, we are more at ease discussing what we perceive as 'lower status' drinking habits than higher status drinking habits. It's very hush hush and shoved under the carpet the higher up we go.....
Also interesting to read people's opinions on drink who grew up with an alcoholic in the family. I have a friend who endured this and it has affected her entire life.
Sorry for the tome, I felt a bit inspired!