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Larry King tried a woman's vape pen . . . it didn't go well

TMZ caught Larry King on the streets and got him talking about the Matt Lauer when he saw a woman using a vape pen.  He took a hit from it and it went into a coughing fit.

Larry King Takes a Hit of a Vape Pen, Coughs It Up

Larry King saw some smoke he liked, decided to take a puff and it was a horrible idea ... according to the ex-cable news guru himself.