I have always experienced significant memory loss from smoking pot ... whenever I went straight for awhile, it would start returning to normal after awhile ... I went without pot for 6 years once, because of job testing ... I could actually 'feel' my thinking return to normal, after a few months ... but, it took well over a year, before I felt totally back to 'normal' ... I would add, Ive been a VERY heavy MJ smoker for a lotta years, so I may be dumber than the rest of ya