>>524752
Or, you just mix sulfur into normal smoke bomb formula and call it a day. The smoke is just as irritating to the eyes, lungs, and mucous membranes as tear gas, and it's lethally poisonous if inhaled in even moderate quantities.
Chlorine gas is just a two component mixture; get chlorine pool tablets and crush them into powder, mix with muriatic acid (diluted hydrochloric acid, also used for swimming pools) and it produces chlorine gas, which is also a strong irritant and fatal if too much is inhaled.
Nitromethane (RC plane fuel) mixed with household bleach creates chlorpicrin gas, which has the lethality of phosgene or chlorine gas, is just as irritating, and it has the added effect of being a vomit gas capable of penetrating most non-military gas mask filters. It penetrates the mask and your options are to either puke inside the gas mask and drown, or take off the gas mask and expose yourself to even more poison gas. CP has also been known to cause headaches so intense that people have committed suicide just to end the pain.
There's countless more chemical weapons out there. Hell, if you want to learn how to make sarin or VX nerve gas at home, just download a pdf of Scientific Principles of Improvised Warfare, it's an entire series of books telling you how to properly make serious chemical and biological weapons (yes, it tells you how to make drug-resistant anthrax and bubonic plague and deploy it in populated areas), as well as explosives and incendiaries. Perfectly legal to own the books, too.