e. Are you an unlawful user of, or addicted to, marijuana or any depressant, stimulant, narcotic drug, or any other controlled substance?
If it is lawful in Colorado, they could honestly answer 'no'.
It’s hotly contested point, but the question pertains exclusively to Federal, not state, law. And pot is illegal re federal. It’s a felony to smoke dope and buy a gun by federal law.