Never leave incense to burn unattended! If you have to leave the room, extinguish it first by dipping the tip in water.
Only use incense in well-ventilated areas! Remember, incense is a smoke and breathing it in is not very healthy. Do not use it indoors unless you are in a very well-ventilated room.
Likewise, use it sparingly! There are plentiful alternatives to cleansing and creating a magical atmosphere besides incense that are just as effective. (Many witches and practitioners who can’t have smoke in their spaces use water solutions to cleanse!)
Overall, if you use incense properly, safely, and sparingly, it should not pose you any health problems.
