>Anyone who supports the Constitution, any so-called conservative, should be standing up for the druggies. We used to day, and some still say it while not really meaning it, I hate what you say (or do) but I'll fight to the death do defend your right to say (or do) it. Those are empty words today.
It's an interesting point, but some drugs are plain bad, like meth. Some can be used in moderation, and it is arguable whether or not occasional recreational use off the job is an issue - everyone has their own opinions, and not every job is the same.
Regarding constitutionality, it is completely constitutional to restrict behaviors that the citizens, via their legislatures, consider to be undesirable, unless it conflicts with a fundamental right like freedom of expression, assembly, religion, arms, and such.
You claiming religion or expression

?
No, I'm not claiming any thing. I'm looking for someone to name the enumerated power that gives the Congress the power to tell us what we can do withour own bodies - what we can eat, drink, ingest? I don't have to claim religion or expression.
The things you mention are a subset of the enumerated and protected rights but they are certainly not all of our rights. Your post is an example of the outcomes that the Federalists feared would happen if there was an enumerated Bill of Rights. Suddenly many would assume those are the only rights.
The Founders attempted to assuade that fear with the 9th and 10th Amendments but, back then and now, there are those who think the only rights protected by the Constitution and the only rights the Government must recognize are those listed in the Constitution and the Bill of Rights.
Either the government has total power to regulate what you consume, and to decide what's good and bad, or they have no power to do that. There can't be an in between. So which do you think it is? All, or none?