I think if you're asking this question it's a sign you're trying too hard. I enjoy a good joke and don't mind if people wanna lighten the mood a bit. But I think people prefer it if you can contribute to a discussion more. We don't care if somebody's funny or not, it's not a comedy club, it's the least of things we care about.
But if I'm going to be strictly honest, the answer to your question is: "no". Sometimes you come off as being immature and even troll-like. I'm sure if you're not a troll, then you don't want that.
And people tend not to like liars, even if it's a, "haw haw, I'm a funny dude cos I just tricked you!" I think that's not shaken off yet, because in threads like the smoking one you just leave immature troll-like comments. You might think you're being funny (or that might be your ruse as a troll) but it just doesn't come off that way. And we have a number of people make jokes and lighten the mood, so we're not a bunch of miserable bastards who need to lighten up a bit.