Here's a balanced take from someone with moderately bad ADHD who very rarely smoked weed (so, not biased).

A mild high feels like a bad ADHD day, but then I had a fewer symptoms after the high is gone. Trace amounts could get me mostly symptomless without any real feeling of "high", but I'm so lightweight that would be less than what most people call "microdosing".

A moderate high...well, probably the same as everyone else (except I would get there for less than most). Then the entire next day it was like I didn't have ADHD at all.

Beyond that, I only did once and I "greened out", possibly related/causal to the part where I "very rarely smoked weed". Greening out with ADHD is like greening out without ADHD I'm sure.