In pre-Hispanic times, the white smoke produced when burning copal was used to purify people and places. The ancient Mayans and Aztecs considered it a god, whose magic and sacred powers, turned him into a protector.
How to use it:
Light a charcoal, and place it in a high heat resistance incense burner containing ashes or sand. Drop small amounts of resins on the charcoal. You can burn this way pure resins or a blend of resins, herbs and oils. Keep out of reach of children and pets. Use with caution. Ventilate the room after use. Do not inhale the smoke directly.
Remember that smudging is an intention-based ritual. With a pure heart and noble aspiration, you will boost its effect.