"The only drink problems are needing to drink or regularly waking up face down in a hedge."
I hope that you're either joking or an employee of the drinks industry.
There's a bit more evidence and thought gone into alcohol limits than just some doctors discussing what the wife had the night before. To suggest that's all there is to it is quite ridiculous, and also quite dangerous.
Patient UK (www.patient.co.uk/health/Alcohol-and-Sensible-Drinking.htm) says:
"Myth - The recommended safe limits are too low
They are based on good research which has identified the level above which problems start to arise. For example, if a man drinks five units each day (not greatly over the recommended limit) then, on average, he doubles his risk of developing liver disease, raised blood pressure, some cancers, and of having a violent death."
There are references listed on the page.
BUPA (www.nhs.uk/Livewell/alcohol/Pages/Effectsofalcohol.aspx) classify "increased risk drinking" as "drinking more than 3-4 units a day on a regular basis if you're a man" and "drinking more than 2-3 units a day on a regular basis if you're a woman".
If you fall into that category then they list the effects as being:
"Men are 1.8 to 2.5 times as likely to get cancer of the mouth, neck and throat; women are 1.2 to 1.7 times as likely."
"Women are 1.2 times as likely to get breast cancer.
"Men are twice as likely to develop liver cirrhosis, and women 1.7 times as likely."
"Men are 1.8 times as likely to develop high blood pressure, and women are 1.3 times as likely."
I'm not going to say that the limits are absolute and perfect but to say that there's no basis for them is just plain wrong.