By Martha Bebinger, WBUR (TNS) When Michael Howard arrived for a checkup with his lung specialist, he was worried about how his body would cope with the heat and humidity of a Boston summer. “I lived in Florida for 14 years, and I moved back because the humidity was just too much,” Howard told pulmonologist Dr. Mary Rice as he settled into an exam room chair at a Beth Israel Deaconess HealthCare clinic.