Sandalwood

Sandalwood: Mentioned earlier this scent has an effect in the area it is being burned or boiled. 

This density of vibration is known to make it easier for certain spirits to use to show themselves in.

With scent, itself, vibration is a given. The scent's vibration of it's own. Everything breaks down to a vibration of molecules, basically.

Some vibrations please some people more than others.  As far as the sandalwoods go though there are a variety of these plants and trees.

Each scent varies to some degree but still holds an earthy or musky scent to it. Not too far from the smell of a sweet or perfumed Sage.

Used in perfumes and cosmetics and is high priced.  It's mentioned in many cultures as something used in ritual for centuries.

Used in workings that have to do with earthly things, anything physical and is one of the most common for an entity to use to manifest in the physical (smoke) form.