An unopened pack can sit in the cupboard for a long time without much happening, but as soon as it's opened, the clock really starts ticking, and how you store it afterwards matters more than most people consider, until a pack that tasted great two weeks ago suddenly tastes flat and dry.
What actually dries out tobacco
Shisha tobacco needs a certain moisture content to burn evenly and release flavor properly, and this moisture steadily evaporates as soon as a pack is opened and exposed to air. Heat significantly accelerates this, which is why a pack near a stove, on a radiator, or in direct sunlight dries out noticeably faster than one stored in a cool place. Pure air contact, even at stable room temperature, will gradually dry out an opened pack over several weeks if it is not properly sealed between uses.
How long an opened pack actually lasts
Properly sealed and stored cool and dark, an opened pack usually remains good for about four to six weeks before the loss of moisture becomes noticeable in the burn and taste. Loosely sealed or stored warm, this window can shrink to only one to two weeks, a greater difference than most would expect from a seemingly small storage habit.
Simple storage habits that actually help
Seal the original packaging as tightly as possible after each use, squeezing out excess air before sealing, as trapped air accelerates moisture loss more than a fully sealed pack. If the original packaging cannot be resealed well, transferring the tobacco to a small airtight container or a resealable bag protects it significantly better than a loosely folded original package. Store cool and away from direct light, in a cupboard instead of a shelf near a window, and away from any heat source, especially in the kitchen, as kitchens tend to have greater temperature fluctuations than other storage locations in the household.
Reviving a slightly dried-out pack
A pack that is only slightly, rather than completely, dried out can sometimes be saved. A few drops of food-grade glycerin or some molasses, common ingredients already used in shisha tobacco production, carefully mixed in, can restore some moisture and burn quality. This works best for only slightly dried tobacco, not for something that has been left open and unprotected for months, where the flavor compounds themselves have probably degraded further than additional moisture alone can fix.
The simple version
Seal tightly after each use, store cool and dark instead of warm and open, and expect noticeably shorter freshness if you are not consistent with both. A well-treated pack can still be really good for over a month after opening, while the same pack loosely sealed on a warm shelf can taste noticeably worse within just one to two weeks.
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