"Watch What Happens Live" on Bravo TV.
Asked to pick the bigger pothead between Matthew McConaughey and Susan Sarandon, Bates said she shared "some good sh##" with Sarandon and Melissa McCarthy last June. "But I didn't inhale," she joked.
Bates played a marijuana smoker in the 2011-12 series "Harry's Law," but had to play a witch in "American Horror Story: Coven" to win an Emmy this year. She played Alice B. Toklas's lover Gertrude Stein on film in Woody Allen's "Midnight in Paris."
Others who've talked about pot with Cohen include Oprah Winfrey and Sarandon herself; Martha Stewart told Cohen that "of course" she knows how to roll a joint.
Thanks to the Smell the Truth blog for the tip.