true cigarettes True (cigarette) - Wikipedia

Heres the data and why it varies

The state of cigarette smoking became so bad that the US Surgeon General released a report for the first time in two decades about the negative health effects of smoking

According to information now available, a puff count equivalent to that of a cigarette is approximately 15 puffs

This taste for Oriental exoticism was also found in accessories, as vanity and cigarette cases of the period show, including this one dating from 1925

Kiurski recommends doing so monthly and says to change the battery as suggested by the manufacturer. According to the NFPA, Manufacturers instructions are specific to the batteries (brand and model) that must be used