Alyson Hannigan Smoking

• Hannigan Hates TV Husband's Smoking Habit August 12, 2009
  Former BUFFY THE VAMPIRE SLAYER star Alyson Hannigan hates kissing TV husband Jason Segel - because he's a smoker. Segel went cold turkey after the actress told him how awful their intimate moments on U.S. sitcom How I Met Your Mother were - but he only managed to stay nicotine-free for a year. Hannigan says, "I cannot stand cigarette smoke, it's like kissing an ashtray and he's trying to be polite by having gum or mints, but it doesn't help."
• Smelly Segel Threatened By Hannigan November 9, 2005
  Actor JASON SEGEL was forced to give up smoking when his HOW I MET YOUR MOTHER co-star ALYSON HANNIGAN refused to kiss him. Non-smoker Alyson, who plays fiancee LILY to Segel's character MARSHALL, was so repulsed by the smell of his breath she vowed not to go near the actor unless he quit.

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Alyson Lee Hannigan, born March 24, 1974, is an American actress who is best known for her roles as Willow Rosenberg in the television series Buffy the Vampire Slayer, Michelle Flaherty in three American Pie films, and Lily Aldrin in the CBS sitcom How I Met Your Mother.

The evidence presented above has led us to believe that Miss Hannigan does not smoke in real life.