When using meth intranasally, what is the absorption rate compared to smoking?

Intranasal use of methamphetamine involves the drug being absorbed through the nasal mucosa, which generally results in a slower absorption rate compared to smoking. When meth is smoked, it enters the bloodstream quickly through the lungs, allowing for an almost immediate onset of effects. This rapid absorption is due to the large surface area of the lungs and their extensive blood supply, which facilitates quick entry into the circulatory system.

On the other hand, when meth is taken intranasally, the absorption is slower because it has to move through the nasal tissues before entering the bloodstream. This route may still provide a relatively quick effect compared to other methods, such as oral ingestion, but it does not match the speed achieved by smoking. Thus, the absorption rate of meth when used intranasally is indeed slower than that of smoking it.