Why do cigarette sellers have to learn to smoke? Tell me a deeper truth.

This sentence is just a metaphor for selling things. You must know it like the back of your hand. Only when you feel it, can you empathize with it, convince others and sell it successfully.

A cigarette seller doesn't have to be able to smoke, just as a seller doesn't have to buy a set himself, just as a car seller doesn't have to buy a set himself. This sentence just takes a little thing around us that everyone knows as an example to show that you must be familiar with and more convincing when selling things to others.

Those who understand the house are left behind, and those who understand politics are left in the grass. Then those who know the smell of cigarettes are also smokers. You can smell the smoke, but how can people who have never smoked understand the addiction, how can they understand the night with only a little spark, how can they understand the smoke ring spit out, and how can they understand the silence of soot? I expanded this casually, in fact, this sentence is not just about cigarettes, hehe.

From the point of view of sales, it is the product to be promoted, and you must know it very well. Generally speaking, if you want to export your ideas to others, you must be like-minded with him, so that you can get along.