Hashish Aromatherapy.

"Most plants have a terpene profile that consists of only one or two primary terpenes, which create their distinctive scents. But the cannabis plant has at least 100 terpenes, which accounts for the great variety in the aroma and flavor of different marijuana strains. And cannabis terpenes can be extracted to make essential oils just as they can be from other kinds of plants. So, essential oils made from cannabis can have significant benefits for the health of both body and mind."

https://hellomd.com/blogs/articles/aromatherapy-is-smelling-cannabis-enough-to-reap-its-benefits

"HOW DOES AROMATHERAPY WORK?
Aromatherapy actually has some solid science behind it. When you sniff something, such as a fruit or a flower, its molecules trigger a response in the olfactory receptors in the nose. Then, olfactory neurons carry signals from those receptors to the olfactory bulb, which begins to process the information about the smell. Special types of cell, called mitral cells, carry signals from the olfactory bulb to an area of the brain called the olfactory cortex. It’s the olfactory cortex that allows you to perceive and recognize that particular smell and distinguish it from all others.

But the olfactory response doesn’t stop there. Those mitral cells that take signals from the nose to the olfactory cortex also carry those signals to other parts of the brain. In particular, they carry the signals to the limbic system, an area of the brain associated with functions like heart rate, breathing, stress responses and memory.

Some of those mitral cells also connect directly to the amygdala, an area of the brain that’s strongly related to learning and memory. This can explain why certain smells may trigger overwhelmingly strong memories and associations in just about everyone. Even people suffering from Alzheimer’s disease and other kinds of dementia can experience memories brought on by smell.

Inhaling essential oils with their distinctive aromas can also trigger this chain of events: By just smelling the oils, the scent of a terpene travels to those highly sensitive areas of the brain responsible for relaxation responses, mood and even pain. That’s how aromatherapy can:

Uplift mood
Ease stress
Promote calm and relaxation"