For example, the first 5 digits of the production code may read ‘14422. ’ The ‘144’ indicates the day of the year the pack was manufactured on, starting from 001, or January 1st. The 144th day of the year is May 24th. The ‘22’ refers to the last 2 digits of a year in the 2000s, so this means the pack was produced in 2022. [2] X Research source Unopened cigarette packs will typically stay fresh for up to 2 years. [3] X Research source

After opening a pack, cigarettes can start to lose their flavor and go stale after 2 days. [6] X Research source

Avoid keeping your cigarettes in the bag for too long. The cigarettes can become too moist and develop an unpleasant flavor. [12] X Research source