For some people, there is no addiction. I would swap between coffee and tea for my morning drink, but it was never an energy boost, just a warm drink for the winter months. Aside from that caffeine has no effect. I stopped drinking both cold turkey in an attempt to cut back on my sugar consumption and had no withdrawals.
Amendments can only be taken away through a 2/3s vote in congress. Being that the split is damn near 50/50 he will never get the votes to remove the Amendment. Executive orders cannot supercede amendments either.