Pinene
Pinene smells like a walk through a pine forest. It is the most common terpene in nature overall. Strains with noticeable pinene are often described as crisp and clear-headed.
What it smells like
Fresh pine needles, rosemary. You'll also find it in Pine trees, rosemary, basil, dill.
Boiling point
About 311°F / 155°C. If you use a temperature-controlled vaporizer, terpenes vaporize at different points, which is one reason the same flower can taste different at different settings.
A note on terpenes and effects
Terpene research in cannabis is still young. Aromas are real; claims about specific effects are generalizations. The best guide is your own experience with a strain, starting low.