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.
More recent research has shown. that the addiction produced by nicotine is extremely powerful and is at least as strong as addictions to. other drugs such as heroin and cocaine. Some of the effects of nicotine include changes in respiration. and blood pressure, constriction of arteries, and increased alertness.