http://www.naturalnews.com/041883_Syria_chemical_weapons_sodium_fluoride.html
Syrian chem attack in 2013 was...
wait for it...
sodium fluoride.
"The lethal dose for a 70 kg (154 lb) human is estimated at 5–10 g.[23] Sodium fluoride is classed as toxic by both inhalation (of dusts or aerosols) and ingestion.[27] In high enough doses, it has been shown to affect the heart and circulatory system. For occupational exposures, the Occupational Safety and Health Administration and the National Institute for Occupational Safety and Health have established occupational exposure limits at 2.5 mg/m3 over an eight-hour time-weighted average."