this research project was designed to provide a summary of the studies related to adult adhd and smoking, and utilize these findings to improve future research about adult adhd and smoking in northwestern ontario. the project is split into three main sections: 1) the epidemiology of adhd, smoking, and substance abuse among the united states, canada, ontario and thunder bay; 2) adult adhd & smoking: a review of the literature; and, 3) paving the way for research in adhd and smoking in nw ontario. a literature review was conducted for each particular section including a search of relevant english databases as well as the grey literature. a more detailed explanation of the methods used can be found in the beginning of each section. overview of section 1: the epidemiology of adhd, smoking, and substance abuse among the united states, canada, ontario and thunder bay