I would suggest that teachers show their students concrete examples of the negative effects of the actions that gangsta rappers glorify. Kareem Abdul-Jabbar
If you sit in a position where decisions that you take would have a serious effect on people, you can't ignore a lot of experience around the world which says this drug has these negative effects. Thabo Mbeki
I believe that your own thoughts can bring on positive or negative effects. So the people who feel sick all the time are the ones who are going to get sick, and the people who are constantly worried about what's going on around them... those are the ones in trouble. Maria Conchita Alonso
I am not a Luddite. I am suspicious of technology. I am perfectly aware of its benefits, but I also try to pay attention to some of the negative effects. Neil Postman
There are people who are excitable by nature and allow themselves to become angry for the most trivial of reasons. Judo can help such people learn to control themselves. Through training, they quickly realize that anger is a waste of energy, that it has only negative effects on the self and others. Jigoro Kano