Recent studies conducted by the CDC - Center for Dease Control indicate that:
Drinking Vodka over ice, can cause kidney failure.
Drinking Rum over ice, can cause liver failure.
Drinking Whiskey over ice, can create heart problems.
Drinking Gin over ice, can lead to brain problems.
Though the studies are not complete all evidence gathered so far is strongly suggesting that ice may not be good for your health.
As a courtesy and public service it might be wise to nform all your friends and bar customers of this potential health risk.