Can the cardiovascular health of cyclists who smoke be significantly improved through the implementation of high-intensity interval training, and if so, what are the most effective protocols to achieve this without exacerbating existing cardiovascular issues? Additionally, what role do nicotine replacement therapy and counseling play in supporting cyclists who smoke to quit and subsequently improve their cardiovascular health? Are there any notable studies or research that have investigated the effects of smoking cessation on cardiovascular function in cyclists, and what were the key findings? Furthermore, what are the most critical physiological markers that cyclists who smoke should monitor to assess the effectiveness of their cardiovascular training and smoking cessation efforts? How can cyclists who smoke safely and effectively incorporate strength training into their regimen to support cardiovascular health, and what are the most important considerations when designing a strength training program for this population?