In general, tobacco is not put into it. It's actually nicotine that is extracted, so the other compounds and chemicals in tobacco are not there. There's a look at whether there should be a 18 mg limit or not, but again, that rationale behind that is still being debated. The regulatory framework in the FDA is beginning to look at this, but I'm not aware of others that are setting limits per se. I think that 18 mg limit is beginning to surface in some fora, but whether that's definitely going to come through I'm not in an expert position to comment on that right now.
On October 28th, 2014. See this statement in context.