I have severe IBS and insomnia so I vape periodically during the day so I can eat and digest properly. I always vape right before bed too. I don't get brain fog since giving up combusting joints. I basically have been mostly vaping for a year, but still used a pipe until I got on here and got my Haze in September. I never got brain fog from the little I combusted in the small pipe, but always did when I smoked a joint. I've only smoked one joint in the last year, but used to go through at least two a day, sometimes three, and always was foggy on them. Fog or not, my health didn't dramatically improve until putting that little pipe down too and fucking combustion. My high now is cleaner, clearer, and much more functional.