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https://en.wikipedia.org/wiki/Sodium_azide

Sodium azide is the inorganic compound with the formula NaN3. This colorless salt is the gas-forming component in legacy[citation needed] car airbag systems. It is used for the preparation of other azide compounds. It is an ionic substance, is highly soluble in water and is very acutely poisonous.[5]

https://www.fda.gov/media/147254/download

BinaxNOW COVID-19 Antigen Self Test - Instructions for Use Healthcare Provider -

On page 4

The Reagent Solution contains a harmful chemical (see table below). If the solution contacts the skin or eye, flush with copious amounts of water. If irritation persists, seek medical advice: https://www.poison.org/contact-us or 1-800-222-1222.

Chemical Name/CAS GHS Code for each Ingredient Concentration

Sodium Azide/26628-2 2-8 Acute Tox. 2 (Oral), H300 Acute Tox. 1 (Dermal), H310 0.0125%

STORAGE AND STABILITY Store kit between35.6-86°F (2-30°C). Ensure all test components are at room temperature before use. The BinaxNOW COVID-19 Antigen Self Test is stable until the expiration date marked on the outer packaging and containers

https://pubmed.ncbi.nlm.nih.gov/12851150/

Sodium azide, used mainly as a preservative in aqueous laboratory reagents and biologic fluids and as a fuel in automobile airbag gas generants, has caused deaths for decades. Its exposure potential for the general population increases as the use of airbags increase. In order to characterize the known health effects of sodium azide in humans and the circumstances of their exposure, the authors conducted a systematic review of the literature from 1927 to 2002 on human exposure to sodium azide and its health effects. The most commonly reported health effect from azide exposure is hypotension, almost independent of route of exposure. Most industrial exposures are by inhalation. Most laboratory exposures or suicide attempts are by ingestion. Most of the reported cases involved persons working in laboratories. The time between exposure and detection of hypotension can predict outcome. Fatal doses occur with exposures of >or=700 mg (10 mg/kg). Nonlethal doses ranged from 0.3 to 150 mg (0.004 to 2 mg/kg).

...

What about repeated exposure to micro doses, right inside the nose?

...

https://en.wikipedia.org/wiki/Sodium_azide Sodium azide is the inorganic compound with the formula NaN3. This colorless salt is the gas-forming component in legacy[citation needed] car airbag systems. It is used for the preparation of other azide compounds. It is an ionic substance, is highly soluble in water and is **very acutely poisonous**.[5] https://www.fda.gov/media/147254/download BinaxNOW COVID-19 Antigen Self Test - Instructions for Use Healthcare Provider - On page 4 The Reagent Solution contains a harmful chemical (see table below). If the solution contacts the skin or eye, flush with copious amounts of water. If irritation persists, seek medical advice: https://www.poison.org/contact-us or 1-800-222-1222. Chemical Name/CAS GHS Code for each Ingredient Concentration Sodium Azide/26628-2 2-8 Acute Tox. 2 (Oral), H300 Acute Tox. 1 (Dermal), H310 0.0125% STORAGE AND STABILITY Store kit between35.6-86°F (2-30°C). Ensure all test components are at room temperature before use. The BinaxNOW COVID-19 Antigen Self Test is stable until the expiration date marked on the outer packaging and containers https://pubmed.ncbi.nlm.nih.gov/12851150/ Sodium azide, used mainly as a preservative in aqueous laboratory reagents and biologic fluids and as a fuel in automobile airbag gas generants, has caused deaths for decades. Its exposure potential for the general population increases as the use of airbags increase. In order to characterize the known health effects of sodium azide in humans and the circumstances of their exposure, the authors conducted a systematic review of the literature from 1927 to 2002 on human exposure to sodium azide and its health effects. The most commonly reported health effect from azide exposure is hypotension, almost independent of route of exposure. Most industrial exposures are by inhalation. Most laboratory exposures or suicide attempts are by ingestion. Most of the reported cases involved persons working in laboratories. The time between exposure and detection of hypotension can predict outcome. **Fatal doses occur with exposures of >or=700 mg (10 mg/kg). Nonlethal doses ranged from 0.3 to 150 mg (0.004 to 2 mg/kg).** ... What about repeated exposure to micro doses, right inside the nose? ...

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[–] • 1 pt

The concentration of the harmful substance matters. On a daily basis you eat and drink many harmful substances including radioactive particles left over from the above ground nuclear testing of the 50s/60s. The human body has an amazing ability to deal with harmful substances if the concentration is low enough and the exposure time is quick enough. If you lived in the days of leaded gasoline being sold and used, your body took in substantial amounts of tetraethyl lead just from being around running cars, but you lived, right? Ever eaten an apple seed by accident (or on purpose)? Did you die from the strychnine in it? How about eating almonds that were raw or lightly roasted? Did the cyanide in them kill you? Concentration of the substance is the reason why those things didn't kill you. Even water can be lethal if you drink too much of it and imbalance your body's electrolytes severely. It's basic chemistry. I suggest you learn some of it.

And btw, alcohol (ethyl alcohol as in the kind we drink) is also acutely toxic. Think about how much you can drink before it kills you and then apply that thinking here. Concentration matters.

[–] • 0 pt

>The concentration of the harmful substance matters.

It's concentrated enough to warrant such warning, obviously

>The Reagent Solution contains a harmful chemical (see table below).If the solution contacts the skin or eye, flush with copious amounts of water. If irritation persists, seek medical advice: https://www.poison.org/contact-us or 1-800-222-1222.

[–] • 1 pt

McDonald's coffee has a warning on it too. Is it burning everyone who buys it?

Yes it has a warning, but that's for improper use scenarios, just like Tide Pods have a similar warning for ingestion and eye contact. Lemons can cause eye damage too if you put enough juice into your eyes. Do you put lemons in your eyes because there's no warning against it on the fruit?

[–] • 0 pt

>McDonald's coffee has a warning on it too.

Oranges and apples