For some people the memory loss is far more noticable than others, regardless of how much you smoke. I smoke on 3 - 7 days of every week. Thats fairly often, but more often than not, I only have 1 or 2 cones. I've been doing this a little over a year now, and theres a very noticable difference in my overall brain capability (such as memory, vocabulary, concentration, and motivation).
There are a variety of vitamins and herbs that are supposed to help increase your ability to remember and also to concentrate. Strangely enough, I can't remember them all
But if you have a look in any decent vitamins section, and read the blurbs, there are plenty that can be of assistance. I've heard that L-Glutamine is effective in decreasing the downsides of marijuana and other drugs. I've got some, but never actually taken it according to how it says you're supposed to on the bottle

So I can't really comment on its effectiveness.
The problem with the wide range of effective vitamins is that they're quite costly, and you could end up spending circa $70 on a couple of bottles that will last you less than a month. Besides, I don't like the idea of downing 3 pills, 3 times a day.
If you are really noticing a decrease in your memory capability, try and limit your smoking to weekends only. I have a mate who quits smoking during his uni terms, and only smokes during the holidays (well, he tries

) and I know it sure helps him out. You can try a variety of vitamins to reverse the process, but in the end, I think you'd be better off reducing the amount you smoke
