Can 5 ccs of air injected into major vein kill?

Injecting 5 ccs of air into a major vein can potentially be fatal, as it may lead to an air embolism. An air embolism occurs when air bubbles enter the bloodstream, which can obstruct blood flow and cause serious complications, including stroke or cardiac arrest. However, the outcome depends on various factors, such as the individual's health, the speed of injection, and the location of the air entry. Medical intervention is critical in such situations to mitigate risks.