Neither President Obama (2016Jun09), nor "President" Trump (2017Feb24), nor "Attorney General" Sessions (2017Mar17) would answer the following questions to each of them about tobacco & alcohol:

Are there any scientific and/or medical purposes for the use of the psychotropic substances tobacco & alcohol? If there are, what are the scientific & medical purposes for the use of tobacco & alcohol?

What are the legitimate uses of the psychotropic substances, tobacco & alcohol, in this country?

What is(are) the reason(s) that tobacco & alcohol are exempt from the CSA [21 U.S.C. § 802(6)]?

Why haven't you called for Congress to either:

1) Repeal the exemptions of tobacco & alcohol from the CSA and classify tobacco as the schedule I controlled substance it is by definition, and alcohol as the schedule II controlled substance it is by definition; 
or
2) Repeal the entire CSA and abolish the DEA?