She was in some communist organization that said in Cuba, no one is allowed to smoke or that no one chooses to smoke - which is already an absurd claim considering it’s reputation with cigars and Castro and Che’s image - and one day when she was in a Cuban hospital (after she and some friends got piss drunk), she saw a nurse smoking on her break, and that broke her fragile brain.
If you’re not able to see the absurdity here, imagine this scenario: you’re a Chinese communist. You hear from everyone about how every American is fat. One day you travel to America and the first thing you see is some fit guy jogging down the street. You declare an eternal war against communism and China afterwards