Dealing with one today. Had our last softball game of the year last night. Stayed out way too late for a Sunday night. A few pitchers of Harp and only 5 hours sleep makes Monday suck balls.
Most likely it has to do with the purification steps involved in hydrating ethylene. I am pretty confident that there is nothing in the natural synthesis of ethanol that will metabolize into anything harmful, unlike the byproducts of hydration.