How do comedy writers do it?

Every time I watch a comedy show/movie that is hilariously funny, I can't help but stand in awe at how talented the writer must be to make all these jokes that land so well.

I'm by no means an unfunny guy, but I couldn't possibly imagine writing several dozen jokes all through conscious thought (As opposed to in the heat of conversation) and having almost every single one hit.

So whats the secret? Is it the fact they have several writing staff on board? Are there certain tips and tricks to it? Is it just natural talent?