Scholars have speculated that Napoleon, ensconced in St. Helena, fell victim of a plot to poison him. Poisoned he was: but not, it seems, by conspiracy. Evidence has shown that the wallpaper in his residence contained the pigment copper arsenite, which combined with mold created vapors containing arsenic trimethyl, which were discharged into the air of the room. The inhabitants breathed in the arsenical fumes, and suffered accordingly.