Please choose the correct ending to complete the given sentence: Health: [header] How to recycle cigarette filters [title] Extinguish the cigarette by grinding out the flame. [step] For safety, extinguish cigarettes fully before attempting to recycle them. You can do this by throwing the cigarette on the ground, stepping on it, and twisting your foot.

Ending1: [substeps] If you find it difficult to extinguish the cigarette on your ground, walk away from the site. Light cigarettes use one of two methods to perform this. Ending2: Do not use your shoe, with the paper and hair in the mess. [title] Call a professional if your work and home are involved. Ending3: Sparks do not flip around easily after using this method. You can also use metal gloves instead if you have one, and proceed to destroy the cigarette with a lighter or match. Ending4: You should no longer see any glowing or smoke coming from the cigarette butt. [substeps] If you have an ashtray, push the cigarette's lit end into it until the heat and smoke stop.

Answer format: ending1/ending2/ending3/ending4