Wanderlust World Wanderlust World Irritating gas from fossil-fuel combustion. Causes respiratory irritation, bronchitis, pneumonia; fatal at high concentrations.
Heavy-metal neurotoxin from smelting/industry. Damages brain (learning deficits, behavioral issues), cardiovascular system, kidneys, reproductive system; carcinogenic (lung, kidney, brain cancer).
Lead vapor is generally more toxic due to systemic, irreversible effects, especially on children. However, actual risk depends on concentration and exposure duration for both substances.