Here's why:
* BIC lighters are designed to be disposable. They are not meant to be refilled, and attempting to do so can result in serious injury or even death.
* The lighter's internal components are not designed for refilling. Attempting to force fluid into the lighter could cause it to leak, explode, or malfunction.
* Butane is highly flammable and explosive. Improper handling during refilling can lead to a fire or explosion.
If you need a lighter, it's much safer to simply purchase a new one. They are readily available and relatively inexpensive.
Please prioritize your safety and avoid attempting to refill a BIC lighter.