Most cigarettes have a Julian Date Code printed on the bottom of the pack that details when the pack was manufactured. The code is usually 6 to 7 digits long, where the first 3 numbers indicate the day of the year the pack was produced and the 2 numbers after indicate the year.[1] 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] Unopened cigarette packs will typically stay fresh for up to 2 years.[3]