Nicotine pouches can expire, yes, but not in the same way as consumable items such as food and drinks. Expired nicotine pouches are not toxic and will not have a foul smell or odour - they’ll simply be less potent. As nicotine expires it slowly degrades, losing efficacy and potency. You can, technically, use expired nicotine pouches, but they won’t be as strong or flavoursome as they would be if they were fresh. Nicotine usually begins to degrade after a year, so for most nicotine pouches you have a year before they should be replaced.