There were some factors to consider when writing on a boyfriend's cigarette, such as: 1. Does your boyfriend like cigarettes? 2. Whether the color and style of writing match the brand and taste of her boyfriend's cigarettes; 3. Whether the content of the words will cause disgust or discomfort to the boyfriend. With that in mind, here are some ideas to write on your boyfriend's cigarette: 1. Express your feelings: Write down your boyfriend's favorite sentence, poem, song, or describe the good memories between the two of you so that he can feel your love and longing. 2. Remembrance: Write down your name, anniversary, birthday, wedding date, etc. or write down your dreams and goals to let him feel your plans and hopes for the future. 3. Brand promotion: If your boyfriend's cigarette brand is famous, you can write down the brand name and characteristics or some words to encourage consumers to buy to increase sales and brand awareness. 4. Apologize: If you don't want to smoke for some reason, you can write some apologetic words to make him feel your guilt and change his mind. No matter what content you choose, you must pay attention to respecting and taking care of your boyfriend's feelings. Don't make him feel uncomfortable or disgusted.