Cooking smoke represents the image of the mother, and sends the author's deep love for his mother and his attachment to his hometown.
2. tied, linked, through the smoke, the author misses his hometown, misses his mother.
3. Where there is smoke, there is a mother, there is a sense of belonging to home, so the writer is happy.
4. Modern civilization impacts the past life, maybe there will be no cooking smoke, there will not be this warm scene.
It also represents the author's fear of losing his mother and the home where he can settle down.
5. The image of the mother is simple and light, gentle and peaceful, always hung up on her son, and the aged mother will lean on the door to see if her distant son has come back.