However, when you want to compare a Boolean variable with the literal Boolean value true or false, it is not necessary to do an explicit comparison, because the result of evaluating a Boolean value is that Boolean value. For example, the expressions
The nicotine in cigarette smoke is a big part of the problem. It raises your blood pressure and heart rate, narrows your arteries and hardens their walls, and makes your blood more likely to clot. It stresses your heart and sets you up for a heart attack or stroke. Know Your Blood Pressure Numbers.
- No, it's not. The effects of nicotine itself are similar to that other popular drug, caffeine. See our (nicotine reading list.) There is no evidence that nicotine causes any substantial risk for cancer, and the research shows that the risk for cardiovascular disease is minimal. The confusion about nicotine comes from anti-smoking activists talking about nicotine and smoking as if they were the same.