Is it permissible to work in stocktaking in markets, given the possibility of stocktaking prohibited goods such as cigarettes, especially with the scarcity of job opportunities?

As long as your work is limited to listing the names of goods available in stores, there is no sin upon you. You should advise merchants not to sell cigarettes due to their prohibition and harm. If you are unable to do so, then denounce it in your heart, which is the weakest of faith.