You're right they do, but the whole thing has been a giant way to shit on the fourth amendment and attack people that those in power don't like.
We should still be able to have bodily autonomy and consume whatever substance we want. Just like women should have bodily autonomy and not be forced to carry pregnancies against their will
Though the one point I will make is that the federal government is enumerated the power to regulate interstate commerce, so while they can't ban the substances, they could make it illegal to transport them over state lines. Such is the reason you still can't take mj from one legal state to the next.