I'm pointing out the false equivalence implied in your "why aren't you using drugs?" not suggesting that a lone individual can stand up to the full might of the US Armed Forces. Several million could, especially if the triggering government issue/event/policy caused defection from within the formal military ranks over to the ad-hoc militia.
Several million drug users mad at the government won't have nearly the same effectiveness.
Several million drug users mad at the government won't have nearly the same effectiveness.