The chart is interesting. However, I question the LD50 of nitrous oxide. I checked the source and it is based on liters of nitrous. Actually, the drug is administered in terms of a percentage of gas that is actually delivered. An effective dose is about 40%. A potentially lethal dose is over about 85%. The point is nitrous can be a very dangerous drug.
pitiful......
studies like these are meaningless...similar to the stats thrown around for man made global warming.....