Since the ancient Greeks, inhalation has been recognized as a highly effective means of ingesting drugs. The extensive capillary surface area of the lungs allows rapid absorption, with a subsequent "rush" that has often been described as second in intensity only to intravenous injection.
since the ancient greeks inhalation has been recognized as a highly effective means of ingesting drugs the extensive capillary surface area of the lungs allows rapid absorption with a subsequent rush that has often been described as second in intensity only to intravenous injection