If you have familiars or pets, then you most likely know that they have sensitive lungs and specific health need that sometimes clash with witchy practices. Certain essential oils are harmful to the health of different pets and smoke (especially from incense) is highly damaging to their lungs. They can be powerful tools to help a ritual, or as components of a spell. Especially incense, which is a great way to incorporate the element of air.
But you don't want to harm your pets by burning in the house.
It's a dilemma for sure, one that, as the owner of four dogs and a cat, I am very familiar with. So here are a few ways I have found to work around this.
1. Do the spell/ritual outside
This can get tricky, especially if the weather is inclement (windy, rain, windy and rain). But by performing the spell/ritual outside you increase the dispersion of the smoke/oils. You will still want to do this away from your animals, such as the front yard, or by bringing them into he house while the ritual is in process. Another draw back to this method is you might not have a space outdoors you feel comfortable/safe performing it in, or a space in general.
If you do the spell/ritual inside, position your incense/oil burner near an open window. Then perform the spell, and while the oil/incense is doing it's thing, take a fan and point it directly out the open window. This will limit the chances of inhalation.
In the case of incense, this means I grind it up in my mortar and pestle and then use the grounds the same way I might use salt or grave dirt in a spell. For oils, instead of defusing them, I anoint my alter/cauldron/self with the oil. If you are using oils and choose to anoint yourself, make sure to dilute them first as pure essential oils are not good for the skin.