If I drank a shots worth of alcohol spaced put over 3 hours, I would not feel anything and I am not a particularly large person

And if you did it every day, you wouldn't feel it at all. But, your liver would.

Really? Most health guidelines suggest drinking no more than 2-4 standard drinks per day. I'd be very surprised if one standard drink per day, spread over a long period, caused any measurable harm.

Guidelines vary by country, but 2-4/day is high at least by current UK and US guidelines.

In the UK it was lowered a year ago to a recommended 14 units per week (UK units - "14 units is equivalent to a bottle and a half of wine or five pints of export-type lager (5% abv) over the course of a week") [1]. CDC website says "According to the Dietary Guidelines for Americans,1 moderate alcohol consumption is defined as having up to 1 drink per day for women and up to 2 drinks per day for men. This definition is referring to the amount consumed on any single day and is not intended as an average over several days." [2]

Actually, there's a Wikipedia page with various countries' guidelines: https://en.wikipedia.org/wiki/Recommended_maximum_intake_of_...

[1] http://www.nhs.uk/news/2016/01January/Pages/New-alcohol-advi... [2] https://www.cdc.gov/alcohol/faqs.htm#moderate

The CDC warns that moderate consumption increases cancer risk:

For some conditions, like some cancers, the risk increases even at very low levels of alcohol consumption (less than 1 drink).

https://www.cdc.gov/alcohol/fact-sheets/moderate-drinking.ht...