Do stand up comics write all their own jokes?

Czarcasm September 29, 2018, 2:55pm 4

And apparently good comedians write gags for other comedians without even knowing they are doing it.

Topic		Replies	Views
How do standups keep track of "their" jokes? Factual Questions	32	2334	January 23, 2019
I want to do standup comedy. Where do I find freelance joke writers? Cafe Society comedian-jokes	89	2717	October 22, 2023
How can I make money with my joke? Miscellaneous and Personal Stuff I Must Share	26	1980	April 29, 2009
Who writes jokes? Cafe Society	9	2936	August 8, 2009
Spontaneous witticisms that weren't really spontaneous Cafe Society	56	3994	December 30, 2019