Certainly something that should be studied. Too bad the federal government in the US effectively banned any research into LSD for decades.
>A group of psychologists at Goldsmiths, University of London, led by Devin Terhune, published the first placebo-controlled study on microdosing in late 2018
https://www.scientificamerican.com/article/do-microdoses-of-...
If you wanted to perform an observational study on whether or not people already consuming LSD are at heightened risk of stroke, I highly doubt the federal ban would affect that.
You won't have any trouble finding test subjects who are entirely cognizant of the dangers but place emphasis on pioneering the study of pyschochemistry.