Remember that the drug acts on the same brain systems that cocaine and amphetamines do. Now, presumably, an educated person, concerned for his livelihood, wouldn't take a revolver with nine empty cartridges and one full cartridge, aim it at his head, and pull the trigger. But granted, decisions of that kind are based on ratiocinative skills. And we have to assume these skills don't exist even among college students. If they did, there would be no drinking in college, let alone drug taking.
Most people perceive themselves as in control of their destiny.
They do not think the initial exposure will ruin their lives, because of their perceived self-control, and they are right. In a now classic study, Stanley Schachter of Columbia University formally surveyed his highly educated colleagues at Columbia. At the same time, he polled the working residents of Amagansett, a community on Long Island where he summered. He first determined who were ongoing smokers, and who had been smokers. He took into account how long they had smoked, what they had smoked, and all other variables he could think of.