I get it... there've been threads on this too... lacking an enzyme, etc.
After a beer or something stronger, I feel my heart racing and my face is warm and I get real tired real fast. On Sunday at a wedding, I had a midori sour and halfway through it I felt my heart racing and got red.
I don't care for drinking to begin with. No big loss. I don't see how some people could ignore the health risks if they are actually experiencing it though... it stops you cold... unless you're a glutton for punishment. If it takes a while for it to happen, it's not the "asian flush".