<p>The Internet of Things (IoT) is gaining popularity and usage in almost every field of human endeavor, enabling devices, objects or things, and computing gadgets to communicate using networks. This has recently introduced the concept of cyber-physical human systems, which is gaining momentum and has become an emerging area of ​​research in IoT. A thorough understanding of the concept of cyber-physical human systems and exploring its length and breadth in enabling IoT guides researchers in assessing their bi-directional impact. This paper evaluated and analyzed approximately 170 articles (100 journals, 50 conference papers, and 20 reports) related to the importance and limitations of cyber-physical human systems in the IoT ecosystem. In addition, the study incorporated data from 50 IoT devices of different types and information on their applications. Additionally, a semi-structured interview has been conducted with 10 experts in IoT and engineering cyber-physical human systems, representing diverse industries such as healthcare, transportation, and manufacturing. The interviews aimed to gather insights on the state of IoT and engineering cyber-physical human systems, their applications, and future trends. It aims to underline the unrealized potential of technology and to bring forth difficulties and potential areas for engineering cyber-human physical systems in the IoT ecosystem. The study concludes by discussing essential findings and then by evaluating previous research and its limitations and suggestions for future work regarding IoT ecosystem-based engineering of cyber-physical human systems.</p>