In 1996 the FDA
did attempt to assert regulatory authority over the tobacco cigarette as a drug or drug/device combination, under precisely the
same provisions in the Food, Drug and Cosmetic Act that it is now claiming apply to ecigs and eliquid, and using precisely the same arguments.
The case went all the way to the US Supreme Court, and ultimately, the FDA was shot down. The Supremes said "no" to the FDA in the year 2000.
Here's the decision (which did figure considerably in Judge Leon's decision in the current case, for it's precendential value and reasoning):
http://www.law.cornell.edu/supct/html/98-1152.ZO.html
It's a fascinating read, if you have the time or the inclination.
PS: The decision in Brown & Williamson is why it took an act of Congress nine years later, that is, the passage of the sweeping new tobacco legislation last year, for the FDA to finally be allowed to regulate tobacco products; but it can do so only as "tobacco products" and under the provisions of the new legislation, and not as "drug" products under the drug provisions found in Chapter 5 of the FDCA.