Yes.  Don’t use your pepper spray past the expiration date on the container. While pepper spray is comprised of ingredients found in peppers, the degradation of peppers isn’t the main contributor towards expiration.  Instead, it is the aging of the propellant in the canister that is the problem.  The propellant deteriorates over time which reduces the effectiveness of the spray.  Be sure to replace pepper spray containers once you’ve reached their expiration date.