Alyson Hannigan And Jason Segel. Lily and Marshall have become one of the best-loved couples on TV on How I Met Your Mother, but even a couple who has as much chemistry on-screen as they has had their own fair share of problems when it comes to their kissing scenes. It seems that Alyson Hannigan, who played Lily on the hit TV show, actually had a problem with the fact that Jason Segal smokes. Whenever Lily was forced to kiss her TV husband she said he smelled and tasted of tobacco, something that she found very off-putting.