Do you mean:
* The challenges of using lighters? (e.g., safety hazards, environmental impact, refilling difficulties)
* The challenges of designing or manufacturing lighters? (e.g., creating durable and reliable mechanisms, ensuring safety features, complying with regulations)
* The challenges of lighter fluid? (e.g., flammability, toxicity, environmental impact)
* Something else entirely?
Once you provide more context, I can give you a more specific and helpful answer.