This GSO standard : - Defines the smoking parameters and specifies the standard conditions to be provided for the routine analytical machine of smoking cigarettes; - Specifies the requirements of a routine analytical smoking machine complying with the standard conditions. NOTE 1: Annex A specifies the ambient air velocities surrounding cigarettes in a routine analytical machine, mechanical design of the enclosures immediately surrounding it, and the methods of air velocity measurement, including the location where air velocity shall be measured. Annex B describes, by way of example, the special characteristics of a typical smoking machine incorporating a piston type of puffing mechanism. Annex C includes a diagram of a puff profile and illustrates definitions and standard conditions.