The decreasing usage of nicotine products in western civilization over the last 30 years should also be considered. At least one study has shown nicotine use r

The decreasing usage of nicotine products in western civilization over the last 30 years should also be considered. At least one study has shown nicotine use results in increased concentration for those with ADHD; it's possible the true number of ADHD adults in western society has been accidentally covered up by the last 400 years of nicotine usage.