system
Given the following post, respond as if you're commenting on Reddit:
human
I believe it is morally wrong to smoke cannabis solely because it is against the law. CMV.

This can be explained fairly briefly. 

As citizens, we are bound to obey the laws of our government. This same government is elected directly by the people and enforces its will (at least in theory) through the same people. When we break the law, whether it is in the form of illegally smoking cannabis or some other illicit action, we not only disrespect the government, but the American people as well.

Your state allows for proscriptions? I still believe smoking would be wrong because first of all, it's still illegal on the federal level, and second, you're more than likely abusing the system to get high.

I don't mean to say that we should never question our government or laws. If what the government is doing is blatantly immoral, it would be our duty to do the right thing (sheltering Jews, etc.). However, these instances are highly exceptional, and the desire to get high should not be listed among them.
gpt
So you agree that there are at least some instances in which breaking the law would be morally permissible, if not an obligation- such as speeding in order to get an injured or sick person to a hospital quicker? Or your example of sheltering Jews in Nazi Germany?

Where, then, do you draw the line, and why is it arbitrarily placed between the different infractions? If there are certain circumstances under which you can morally break a law, why does any law have any moral value in and of itself?