Hi @ywon
Generally, Adblockers typically block third-party cookies by default rather than first-party cookies. Third-party cookies are set by domains other than the one you are directly visiting, while first-party cookies are set by the website you are actively engaging with. Adblockers focus on blocking tracking scripts, ads, and other content from third-party sources to enhance user privacy and security.
This thread answers your question based on Adobe Target uses its first party cookie and third party cookies and also here is the official documentation
I don't have any stats for people using adblockers in Canada however after googling I found this link
https://backlinko.com/ad-blockers-users
Hope this helps.