I’m fairly new - I’ve only been reading Brando’s book for about 4 months.
My addiction started when I read WoT and I went on to Warbreaker because I really enjoyed his writing style for the end of WoT. I’ve been selling off my smaller possessions to buy SA and Mistborn the first Era. I had a sample of Elantris recently though and I’m definitely going to have to sell something else
In all seriousness though, I’m really glad that I found Brandon Sanderson’s Cosmere because I’ve found several new authors that I also love. I never would have found them if I hadn’t picked up Brando’s books when I was done with WoT