Is my profession a break in Buddhism?

In fact, you already have the answer yourself, and you don't need others to say it. But many things in the world are sometimes difficult to define clearly. If you can always extricate yourself, repent and explain the situation to the Buddha and Bodhisattva, I believe the Bodhisattva will help you find other suitable job opportunities. However, if it is really difficult to find a job, it is also a kind of merit in disguise that you often persuade people to quit smoking and tell others the news about smoking that others don't know. After all, if you are really forced by life, Buddha and Bodhisattva will understand you, but you'd better always repent your merits and demerits. I hope you can think for yourself, and bless you, Amitabha.