I'm pretty sure Edi doesn't smoke either but I could be wrong. I haven't been keeping tabs on this particular topic. for some reason a lot of fans are convinced Ashley doesn't smoke but I recall seeing set pics of her and everyone else, save for Taylor and Edi, smoking. Go figure.
I know there was a small interview recently where Ashley talked about a few cast members saying they might try to quit but I doubt most of the cast will. It's VERY hard to quit and they may not want to in reality.
If anyone happens across that interview, keep in mind that the earlier topic of discussion (Rob and Kstew together) is based on a fabricated article. Emma Watson never said they were an item and is possibly pressing charges for slander.
Rob and Kstew are still NOT together. Ashley was just humoring the interviewer.