First of all, let’s see if there is a prohibition on smoking in the company’s rules and regulations. If there is, it will be easy to handle. If you are caught, you will be punished. Although the employees pretend not to be afraid, and the boss is afraid of losing employees. But in fact, employees are very afraid of losing their jobs. Besides, just pay attention to the scale when you start. Don't go too far and don't go too light. If there are no relevant rules and regulations, it will be troublesome. Prepare an agreement on no smoking in the unit, along with relevant penalty clauses, and have all employees sign and fingerprint it. Anyone who violates the regulations in the future will be punished. Of course, you can't do this signing and fingerprinting thing on your own. You have to find support from upper management with considerable prestige. Otherwise, the employees won't buy your account.
As for arresting people, that’s not easy. Since you know they are smoking inside, you know the approximate time and place where they are worried, so just wait and wait