You don't need a security clearance. It wasn't a crime to smoke pot in 1900, and pot itself does not one any damage. And I've never smoked pot! I do live in a state that has decriminalized it. In a few years it won't matter across the whole country. We'll still have things you puritan can use to look down at people, so don't fret. Mushroom (I've also never taken these either, person!) aren't becoming legal soon. Although they again cause no one any real trouble.

I held a top secret clearance for 8 years, and worked in the DC area.

Those jobs suck, and your attitude does as well. You sound like a stuck up prude.