So, if actors can’t smoke actual cigarettes on set, what do they smoke?“I will tell you they are made out of some kind of thing that’s just not tobacco,” Christina Ricci said.She's right. "Herbal cigarettes" is a pretty vague term, but it basically means that the cigarettes in question don't contain tobacco or nicotine. Instead, they can be filled with anything from rose petals and clover leaves to licorice, and even lavender. And while little research has actually been done on how bad they are for your health, experts believe that smoking — even if it's just marshmallow leaf — is still smoking. (Translation: It's not as bad as a real cigarettes, but you probably shouldn't be smoking two packs a day.)Regardless of their composition, Ricci says that the fake cigarettes are gross ("They give you the worst headache."), a fact that David Hoflin confirms: “I’m not a smoker and when we first got there I was like, ‘I’d like to have an herbal cigarette,’ but they were worse than actual real cigarettes. The biggest problem that you have when you smoke herbal cigarettes is the smoke — I don’t know why but it always gets in your eye."Hoflin continued, "So, you’re smoking, and then you blow it out and the smoke just comes in your eye and then you can’t see anything, and obviously it’s on camera so you’re trying not to blink. I don’t know why that happens but real cigarettes didn’t do that. F. Scott was a very big drinker and so [I was ] like, ‘You know what instead of having a cigarette I’ll have a drink in my hand,’ because I was getting tired of not being able to see.”