A smoker trying to quit is more likely to succeed if his or her doctor greatly exaggerates the dangers of smoking. Similar strategies can be used to break other habits. But since such strategies involve deception, individuals cannot easily adopt them unless a doctor or some other third party provides the warning. Which one of the following is an assumption on which the argument depends? ["The more the relevant danger is exaggerated, the more likely one is to break one's habit.", 'People generally do not find it easy to deceive themselves.', 'A doctor is justified in deceiving a patient whenever doing so is likely to make the patient healthier.', 'Most of the techniques that help people quit smoking can also help people break other habits.']