a-Pinene, as its name describes, is often found in conifer trees and pine needles. This terpene is known to help with the symptoms of asthma and improve airflow to the lungs — a bronchodilator — and can also help with inflammation. Have you ever felt especially alert after walking through a forest on a warm, sunny day? This is probably because of a-Pinene. You can learn more about the terp here.