According to [http://Chicago.timeout.com/articles/tv/74345/interview-with-johnny-galecki-of-the-big-bang-theory|this interview], he likes women. To quote:
TOC: I read you were out as hetero. So you're not out as anything? Johnny Galecki: No, I happen to love women, so I guess that would make me hetero -I don't know. I don't mean to be so enigmatic, but I'm trying to keep from offending people.
Note: He does not want to label himself as he has a great fan base from both the gay and hetero communities. He is actively seeking a wife (female) as he wants a family and is at an age where he needs to get going on this.
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yes he is a smoker.
Sally Kirkland
Johnny Galecki (from Big Bang Theory, Roseanne, Vacation, etc)
There has never been a rumor or any other indication that Johnny Crawford is gay, now or ever.