尼古丁不懂夜de黑尼古丁不懂夜de伤
[ní gŭ dīng bù dŏng yè de hēi ní gŭ dīng bù dŏng yè de shāng]
Nicotine does not understand the darkness nor the wounds at night. Here 'night' metaphorically stands for suffering and loneliness while associating them with cigarettes which people often resort to during tough times. Hence it signifies coping mechanisms when confronted with hardship.