What smells can make a person unconscious?

* Chloroform: A colorless, volatile liquid with a sweet odor, chloroform was once commonly used as a general anesthetic. However, due to its high risk of causing death, it has been largely replaced by safer alternatives.

* Ether: A colorless, flammable liquid with a strong, pungent odor, ether was also once commonly used as a general anesthetic. Like chloroform, it is also highly flammable and can be fatal if inhaled in high concentrations.

* Halothane: A colorless, nonflammable liquid with a sweet, pungent odor, halothane is a general anesthetic that is still sometimes used today. However, it can cause liver damage and is therefore not recommended for people with liver disease.

* Isoflurane: A colorless, nonflammable liquid with a fruity odor, isoflurane is a general anesthetic that is commonly used today. It is less likely to cause liver damage than halothane, but it can still cause side effects such as nausea, vomiting, and confusion.

* Sevoflurane: A colorless, nonflammable liquid with a fruity odor, sevoflurane is a general anesthetic that is commonly used today. It is less likely to cause side effects than isoflurane, and it is also safe for use in children.