The glue.

Everybody knows that sniffing glue is bad for you. Regularly, when the kids come by for a glass of water, a slice of toast or just a talk, I catch them while they are sniffing their little jar of glue.
I then ask them if I can have a sniff as well! They always tell me: "NO, it is very bad for you. Keep away from it."
So, they do realize that it is harmful. Still, the benefits must be of that kind that it makes it worthwhile to keep on sniffing.

Here's a story about glue.
One 15 year old boy has a home to go to at night. He is the oldest of 4 boys. His dad left the family half a year ago to live with an under-age girl. His mother sends out the four boys to the Granada streets in the morning. They don't go to school. They have to beg for money and food. When they've gathered some money they go back home to their mother, who sells them their glue to sniff. She gets the glue free from the local zapatero, a man who repairs shoes. He pays the children's mom with glue to have sex with him. The mother's new live-in boyfriend has just turned seventeen. He stays over at night; and with the four boys present in the only room of the house, he and the mother have sex. These 4 boys have no positive role model in their young lives. It's a sad but true story.