Smoking

Kids under 18 can't buy cigarettes in the U.S., but they can legally work in tobacco fields when they're as young as 12.

One of those kids is Eddie Ramirez, 15, who works the fields in the summer.

"It just sticks to my hand," he says of the plant. "It's really sticky, you know, and really yellow." It's nearly impossible to wash off, he says.