My man, drink away, being British rather than american alcohol does not scare me and i dont have to be an all or nothing drinker. I, like many over here in the UK can happily drink, or not drink, as the fancy takes us. Drinking in moderation offers many benefits, most notably to mood and general personal happiness.
The only 2 downsides i can see to drinking whilst on the tri-lean system (which i too am on) are these
1) you are cutting dude, 5 or 6 cans is a bare minimum for a night with a m8, thats around 1500 calories, that wont help you cut.
2) if you are made drowsy by the lean dreams then alcohol may exacerbate this. Additionally you may be putting extra strain on your liver.
So in summary, if you're a young healthy and fit person who can handle casual drinking, then go for it.
oh and btw, coupla HD3's in the morning, pint of water, protein shake then back to bed for an hour. Kills hangovers....dead!