I have an account and I occasionally do my daily session high. I only use Cannabis on the weekends, so occasionally on a weekend I'll be high playing my lumosity for the day. It seriously doesn't seem to affect my memory or speed or anything at all. I'm not any better (no sativa super powers heh), but I'm not any worse. Now this is at about a 6/10 or below. I haven't tried it while super baked. I'd call the no negative BPI (brain power index -- their comparative system that indexes you against everyone else) from Cannabis use a nice little success. If it was damaging my cognition in any way I probably wouldn't be as big of a fan of Cannabis. Right now I honestly don't feel like it is. What seems to damage my brain power the most is lack of sleep and having a day with a lot of stress/anxiety. Any other lumosity members on here? If you aren't, I'd recommend getting a free (no cc) 2 week trial just for kicks. It's free but after that it's a monthly paid service. I have lifetime because I enjoy it.