Zach Galifianakis Smokes Pot On Bill Maher's Show (VIDEO)

Zach Galifianakis lit up late-night TV, literally, when he decided to smoke some weed on HBO's 'Real Time with Bill Maher.'

Maher -- a longtime opponent of legislation outlawing marijuana -- welcomed Galifianakis (currently promoting his new buddy movie 'Due Date,' co-starring Robert Downey Jr.) to the set of his current-events talk show, where a live panel discussion ensued about California's upcoming vote on whether to decriminalize the drug.

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