Dr. Seth Ammerman listens intently to his new, 21-year-old patient. Ernesto, who does not want his last name disclosed, is homeless. He is earning a high school degree and working part time, but at night, he and his brother share a tent that they set up on the streets of San Jose, Calif. The daily stress of being homeless is wearing Ernesto out, and making him light up too many cigarettes.
"I just want to cut down on my smoking," says Ernesto, in a tentative, soft voice. "I've been on the streets all the time, you know? I just want to make sure I'm OK."