I use candle snuffer for most spells, except the ones I am sending something away from me (negative energy, worries), or simply sending away a message in a form of energy.
If you are anxious person breathing in deeply and then releasing it helps you to release some of the stress, raising within. In way you are releasing it by sending it away.
In my culture(Slavic) the nouns for soul and spirit are derived from the verb breathe, and same is valid for Latin and Greek. Therefore, it is believed that when you breath in you are accepting energy and when you breath out you are sending it away.
Same train of thought is applied in internal martial arts, where you breath in and pull in the chi(life force) and then breath out and push it out, while closing the cycle and being in balance. Thus, receiving the consciousness and/or the life force and then sending it away with your own input.