Hey, the most toxic poisons known are organic. Produced by various strains of Clostridium botulinum. Median lethal human dose ~1microgram/kg if injested. By inhalation, 10–13 ng/kg. One million nanograms of THC inhaled (1 milligrams), would hardly have any effect at all. So, for the sake of comparison, inhaled, botulinum toxin is ~~5 million times as lethal as THC is stoney. Potent shit.