Please choose the correct ending to complete the given sentence: Health: [header] How to prevent smoking relapse [title] Throw away any remaining cigarettes and lighters. [step] It can be very difficult to quit when you can just reach for a cigarette nearby and light it. Making it difficult to smoke will help you on days when you have strong cravings.

Ending1: If you are tempted to smoke, your body's natural defense mechanism to fend for yourself is to go for cigarettes, not other tobacco. [substeps] If you try to pull on nicotine, you might burn yourself without realizing it. Ending2: [substeps] Avoid cigarette counters at stores when you can. For example, if you are at a gas station, pay at the pump rather than going inside if possible. Ending3: If you have left your window open, keep a close eye on the smoke and remind yourself to quit. Remember what you took out before throwing away the smoke. Ending4: [substeps] If you notice your craving increasing, immediately throw away all of your cigarettes. Remind yourself that you should quit completely to prevent relapse.

Answer format: ending1/ending2/ending3/ending4