This study examines the complex array of impediments and potential advantages of internet of things (IoT)-enabled secure and intelligent smart healthcare devices (IESISHDs) associated with the shift towards enabling smart cities, motivated by the pressing necessity to address climate change and promote sustaining smart healthcare systems. This study looks at the technological, economic, and social problems that need to be solved in order to make cities smarter with IoT. It does this by reading a lot of scholarly sources. Most stupendously, it emphasizes the environmentally sustainable merits, potential for economic growth, and improvements in societal well-being that can arise from this transition. It further depicts selected case studies to demonstrate sustainable empirical evidence and provide policy recommendations. The paradigm is to assist governments and other stakeholders in effectively managing human-associated challenges to attain maximum sustainable value and an innovative healthcare future that guarantees worldwide prosperity and ecological welfare.