A surprising amount of Americans are admitting to having clocked in at work while high.

A poll from SurveyMonkey and Mashable.com finds that 10 percent of workers have showed up at their place of work under the influence of marijuana.80% of them say the pot they smoked was purchased illegally.

Working high on other types of drugs is less common. Only 3% say they've worked under the influence of an illegal drug other than pot.

28% admit to working on prescription drugs, but over 90% say they were taken for medical reasons only.

[Metro Networks]