Chat GPT, a generative AI technology was introduced in November 2002. Academic discussion about potential student use and potential abuse of Chat GPT was prevalent at introduction. However, actual student use of Chat GPT was unknown. In May 2023, we surveyed 614 predominantly-STEM undergraduate students at a R1 public university in the Northeastern United States about their use of Chat GPT. We asked qualitative questions about how and why they use Chat GPT as well as reason for not using ChatGPT. Apriori coding was used to code student responses. Forty-one percent of students has used Chat GPT to help with some aspect of their academic work. Most students used the technology ethically, to support learning and identified utility and ease as the primary motivation for use. Concerns about academic integrity were prevalent in users and non-users of Chat GPT, indicating a desire for ethical use of the technology.