α-Pinene is one of the many terpenes and terpenoids found in cannabis plants. These compounds are also present in significant levels in the finished, dried cannabis flower preparation commonly known as marijuana. It is widely theorized by scientists and cannabis experts alike that these terpenes and terpenoids contribute significantly to the unique "character" or "personality" of each marijuana strain's unique effects. α-Pinene in particular is thought to reduce the memory deficits commonly reported as a side-effect of THC consumption. It likely demonstrates this activity due to its action as an acetylcholinesterase inhibitor, a class of compounds which are known to aid memory and increase alertness.