Incense cones bring smokers to life. That is, as long as they're made for each other. Incense does not always burn out on its own as it should after being lit once.
Most of the time, however, neither lacking quality nor excessively long or improper storage is the cause. As with many things, the rule: „the older the better“ applies. If stored dry and without a plastic bag, only in the collapsible box, incense can be preserved for a practically unlimited period.