Is it haram to promot a vape business

Assalamualaikum Assalamualaikum We have our agency where we build applications and websites for businesses and people We got a client where he has this vape business shops and he wants us to build an APP for them basically a loyalty app where customers earns point which makes them return more customers The business promotes everything related to vapes and I dont feel good about marketing such a businesss Please guide me by the will of allah on how can I find allahs pleasure in this situation Jazakallah khairun