system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:How unique is each persons set of capillaries, veins, and arteries compared to everyone else?

While I understand the general shape will (hopefully) be the same, how much variance is there in the path of veins and where capillaries branch off and meet back up?
gpt
Not only are your capillaries unique, they're also constantly changing. Angiogenesis is the process whereby the body creates blood vessels.

As for other vessels, major vessels will be generally in the same areas (jugular vein, femoral artery, etc), but the smaller ones may have some variation from person to person regarding their exact location. The general layout and vacinity will be the same, but the exact path will vary slightly. 

Just hold your left hand next to someone elses and look at the differences in the veins on the backs of your hands.