Gambling & smoking limited but not entrepreneurship and stock trading?
bkovitz: There are dangers involved in eating at McDonald's, going to grad school, talking to strangers, thinking things through very carefully, dressing funny, starting religions, getting married, staying single, doing meaningless homework, getting a cubicle job, and heeding the advice of your high-school guidance counselor.  The dangers are quite severe, including heart disease, getting beaten up, and living a wasted, unfulfilling life (a fate worse than death).