This may help to explain the success of Silicon Valley, one of the last workplaces in America where hard and soft drinks still jostle for space in the company fridge.

ECONOMIST: The sad demise of the three-Martini lunch

The amount of caffeine in energy drinks is hard to pin down, because many are marketed as supplements, rather than as foods, allowing them to wiggle around FDA regulations and labeling laws.

FORBES: Can Energy Drinks Kill? The FDA Investigates, Consumers Worry, A Business Under Fire

Drinking alcohol is just as hard on a person as smoking, especially someone that drinks more than a drink or two a day.

FORBES: More Employers Shun Tobacco Users

Not many years ago hard liquor seemed destined to go the way of some now virtually extinct soft drinks such as Moxie.

FORBES: Fact and Comment

Hard to gauge, but consider how less appealing meal and retailer deals are when alcoholic drinks are excluded.

FORBES: Groupon Faces Widespread Alcohol Sale Problems, Attorney Says