How does it feel when you light up a cigarette? Do you feel a rush of conflicting emotions? You may feel calm and happy and at the same time you may also feel frustration and regret. Most smokers are well aware of the negative consequences of their habit. Many are planning to quit, but the temptation of nicotine can be hard to resist. Each time you smoke a cigarette, your brain gets a rush of feel-good chemicals known as dopamine. Inevitably, however, these levels drop, and you feel the need to smoke more nicotine to get the rush. This basic cycle defines most types of addiction. What makes smoking especially dangerous, however, is its prevalence and the resulting fatal health complications. You already know that smoking greatly increases your risk of cancer. Unfortunately, most people aren’t aware of just how much smoking can increase the risk of developing cardiovascular disease — and that too at an early age. In fact, of all the things that increase your risk of he...