2.5 mg alcohol for 1'000'000'000mg of your body weight - it is not possible, ALCOHOL intoxication does not exist!!!!
Alcohol, like CO2, consists mainly of Carbon and Oxygen - a coincidence??!!??!!??!!!??!?! 8-)
and what is it proof of?
small concentration of some substance can't have a huge effect? what is your weight?
100kg? =100'000g =1'000'000'000mg
1.05 per mille = 0.5 mg of alcohol per liter of blood, which you have 5l
so 2.5 mg of alcohol is enough to make you puke