cigarettes: yes. marijuana: no.
If she has a problem with it, tell her to piss off. Marijuana can be really enjoyable and if it's not being detrimental to your life or you're not dependent on it, go nuts. Alcohol is worse.
And btw, deadbeat potheads would be deadbeats otherwise. TONS of people smoke up now and then and lead normal lives. But of course everyone loves to focus on the deadbeat potheads. Hey, let's focus on deadbeat alcoholics and ban alcohol and see how that goes.
If there's one subject the american populace has been lied into utter ignorance on, it's marijuana.