It is very noticeable to basically everyone when you consume cannabis regularly.

I don't (I find cannabis unpleasant) but I don't think this is at all true.

I think serious studies would be strongly preferred here, as compared to anecdotes or conjecture. I don’t even know if I disagree with your stance, it’s just an absence of data is not convincing.

not exactly. Depends how you consume it. Smoking, yes probably. The other forms of cannabis are less obvious. They are clearer highs without smell or smoke and much less burnout.