What are the allusions or stories of the sentence "smoke from ancestral graves"?

Legend has it that if a person becomes immortal, his body will turn into a wisp of smoke and float to heaven, from which comes the idea of feathering. The ancestral graves are full of smoke, which means that some ancestors have become immortals. Being the ancestor of the gods will naturally bless future generations. The ancients said that the ancestral graves are full of smoke, which means good luck. According to geomantic omen, blue smoke is a kind of cyan gas, which is an auspicious sign and represents the prosperity of official transportation.