Gallup, which started tracking Americans' alcohol habits more than 80 years ago, says the drop in drinking rates coincides with Americans' growing concerns that even moderate drinking is unhealthy.

"Or people curious in decreasing the amount of alcohol they drink." According to Gallup, which has tracked American drinking behavior since 1939, just 54% of adults self-reported using alcohol last year.

The Gallup poll on American alcohol consumption comes during a time when many medical experts are advising stricter drinking guidelines.