I don't see why not.
I've never tried it, but I have smoked cigarettes that contain no tobacco at all.....and I am not talking about those that contain marijuana.
In Delaware there is a total smoking ban, but only for tobacco products...the law is very specific about what falls under the ban, and it specifically states tobacco.
There are actually many cigar and cigarette products on the market that contain no tobacco at all. According to Delaware law, those can be smoked anywhere.
Only one has made the news, but I know of more than one bar that has beaten smoking ban violatins by requiring the state to prove it was tobacco being smoked. Initially it was up to the accused owner that he/she didn't violate the ban, with this it is now up to the state to prove the establishment owner did violate the ban........which of course is the proper state of affairs.