Based purely on how I think they come across on and off the bike, I believe the Major 2's respective introductions to the world of PEDs must have went something like this:
Pogačar will have been all like "Wow, this stuff can make me ride faster and make my hair glow twice as much? I want to try one of everything please" before he began to school people on the correct pronunciation of Erythropoietin shortly after.
Vingegaard on the other hand will have been hestitant and scared ar first, wondering if he should call his girlfriend or his mother and grandmother, but he quite quickly succumbed to peer pressure, telling himself it was okay because he was used to working with fishy stuff. Being introduced to it by a doctor also made him believe, that following a guy in a white outfit would always be the right thing to do.