Commerce does not apply to illegal activities. Importing Sex Slaves, or Drugs, or Anthrax spores do not constitute "Commerce."
This is commerce "with foreign nations", not interstate commerce. The were specified separately because "with" and "among" mean different things, and were intended to be treated differently. If it was all intended to be treated the same, they would simply have said "to regulate commerce" and left it at that.
Again, it is NOT Commerce because it is illegal. I also noticed that you did not answer my question. (Does the government have a right and a duty to ban the importation of fissile material?) The reason you did not answer my question is because you know that you must acknowledge that they can, and in doing so you destroy the basis for your own argument.
We The People... Have a Right and a Duty to ban dangerous and destructive substances.
Fair enough. Now, which level of government are you going to use to do it? If you're going to have your state do it, then all you need is for the legislature to enact that prohibition and make the necessary provisions to enforce it. If you want the national government to do it, then you need to enumerate a power for that, because there is currently no "dangerous substances" power granted to Congress by the States, and enumerated in the Constitution.
>> “We The People... Have a Right and a Duty to ban dangerous and destructive substances.” <<
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Marijuana is neither.
Like many other things, it is a mostly beneficial substance that can be abused in certain ways.
You must be a democrat, with your bent on control.