It does both. It grants certain powers to the federal government, but with many limits, especially the Bill of Rights.
Also, the Bill of Rights didn't limit state governments until a SCOTUS ruling stating it was so via the 14th amendment. - https://en.m.wikipedia.org/wiki/Incorporation_of_the_Bill_of_Rights
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Will a quality catch can stop the majority of vapor from an ecig mod? I bought an ADD W1 can, have not modded it yet, but it has no measureable vapor reduction. If there is still no reduction after modding it, i'm not going to install it. I'm not sure i would purchase a $300 catch can either if I can't see it vastly reducing vapors from an ecig.