For a couple of years I was drinking 1-1.5 bottles of wine a night, possibly 3-4 times a week? Mostly alone. I was absolutely psychologically dependent. I used to 'plan' my drinking evenings, what food I'd have to accompany the alcohol and completely look forward to them like a normal person would look forward to eg a trip to the cinema. I used to crave the first drink and like a PP, would find evenings when I didn't drink boring. When I moved in with my now DH, I'd buy a bottle of wine at the station for us to share mid-week, because that was normal, right? But I'd also buy a couple of mini wine bottles and keep them in our room and sneak out throughout the evening to have a swig. I used to keep the empty bottles in my wardrobe and every so often take a trip to a public bin to get rid of them.
Deep down I knew it wasn't normal, but my parents were/are (not very) functioning alcoholics (my mum is just 70 but has had dementia for around the past 10 years and lives in a care home - dementia is mixed dementia so has in part been caused by a series of mini strokes, which I believe in part to be caused by alcoholism). So it was what I grew up with - parents drinking wine heavily at home - occasionally they would say they were 'on the wagon' and have 2-3 days maybe of not drinking, then a Sunday afternoon beer would maybe creep in and it was back to 3-4 bottles of wine a night between them, 4 times a week. But obviously because they didn't drink in the morning or drink spirits, they weren't alcoholics.
My DH helped me realise that it wasn't normal and I really got into running (probably also addicted but at least it was healthier!) and it got to the point that I didn't want to drink on a Fri or Sat evening because I wanted to run the next morning and the high I got from running was much superior to the drinking high.
Now I am pretty much teetotal (I had a glass of prosecco on Christmas Day which I felt the effects of the next day!) which was probably the first drink I'd had since last Christmas. I think in the past five years I've averaged about 1-2 drinks a year. I actually don't like the loss of control feeling you get from those first few sips which is what I used to crave!
Have two young DC now as well which has also completely changed my mindset because 1) I struggle enough as it is with the sleep deprivation - I want what I do have to be the best quality! and 2) I don't want them growing up like I did to think regularly drinking at home is normal.
Which it really isn't - I think as PP have said, we do have a culture of low-level alcoholism.
Sorry if that completely went off on a tangent. In essence, yes this is definitely problematic drinking. However much they deny it, I can guarantee it will be affecting their health, relationships, it will be causing sneaky behaviour and lies.