Well that's kind of interesting regarding the neem cake making people feel queasy. That's not uncommon. I applied three boxes (a lot) recently and got sick that evening. Interestingly, I was playing with ISO the same day and also felt it might've been related to or compounded the issue. After reading the previous posts I figured I should mention that combo again.
Also, regarding the peanut scent.. I've smelled something kind of similar in Grandevo. A Chromobacterium pesticide formulation. I don't mean to start any rumor about that specific product, just an observation since you're researching something new.
People who break up weed, roll it and lick the paper probably have a much different exposure to consider too.