There isn't an option for me in this poll. Around people I'm comfortable with and who have no issue with cussing, I swear quite a bit. It's just a part of my idiolect. I don't swear in public, around my parents, or around people I don't know very well. Once I learn that someone doesn't have an issue with swearing or isn't going to pass off judgment on me, I speak how I normally would. I'm a regular sailor, hah.
So a voting option for me would be "I only swear around those who don't mind, and when that happens I swear a lot."
To me, cussing says very little about someone's intelligence or vocabulary. I know a tonne of people who swear regularly, yet their speech is also peppered with "big" words. I also know a fair amount of pretty dull people who rely on euphemisms and think swearing is so gosh darn frickin' awful. You can refrain from swearing all you want, but if you're a dull-minded person you aren't going to be able to hide that very successfully. I pay attention to the content of what people say, rather than simply zoning in on how many times they say "fuck" or "shit".