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.
Glucosamine may affect blood pressure. Caution is advised in people with high blood pressure or heart conditions, or those taking drugs or herbs and supplements that affect blood pressure. Glucosamine may cause abnormal heart rate and palpitations. Glucosamine may affect insulin resistance and/or blood sugar levels.