Mars, I know you said you haven't looked into any of these substances, so I wanted to show you just a few pages I've seen that talk about marijuana or nicotine in relation to ADHD. With marijuana, it seems right, in that there are not a lot of controlled studies... at least for ADHD. I actually think it has to do with the government, because they won't let researchers import marijuana for studying.

Here is an interesting page, with stories about how marijuana helps people's conditions, including add or adhd:
http://rxmarijuana.com/comments_and_observations.htm

Here's a 48 hours cbs story of an 8 year old with ADHD (among other things) that is being treated with marijuana:
http://www.cbsnews.com/stories/2002/...in503022.shtml

Marijuana has been used for thousands of years for physical maladies, and mental maladies. Marijuana actually can be split into two groups. Cannabis Indica and Cannabis Sativa. The sativa gives you a clear headed, energetic, up and going , motivated , focus, high. The indica is all in your body, and relaxes you. Then, there are the hybrids, which are common.

So, the type you use, and the amount you use, has a big effect.. but it can help a lot of people.

As for nicotine, here is one study showing that nicotine was good or better than ritalin at eliciting a normal inhibition response.
http://www.uvm.edu/~psych/news/archi...r_nicotine.pdf

I really think saying marijuana or nicotine cannot help people with ADHD is false. I think many people with ADHD self-medicate with these substances. The anti-drug crowd (but pro pharma drug crowd) would call this "substance abuse". But I really think this is unfair. If someone takes 5 ritalins a day to get their head straight, I think they are doing the same thing when someone intakes nicotine 5 times a day, or intakes a dose of cannabinoids at the end of the day.

Its all self medication.