I'd only tell if the opportunity came up. If I coughed and someone asked, or if I was using the money for related expenses, stuff like that. I love any opportunity to educate, but I wouldn't just jump in with "Hi I'm Emily, I have CF." I know someone who's a lesbian. She's a good person. But when you meet her she's immediately like "Hi I'm Sally, I'm a lesbian" and it's just like whoa... uhm, okay?