Abstaining

verb

1. Keep or withhold oneself.
2. Refrain from (something or doing something); keep from doing, especially an indulgence.

   "In order to improve his health, Rob decided to abstain from smoking."

3. Fast (not eat for a period).
4. Deliberately refrain from casting one's vote at a meeting where one is present.

   "I abstain from this vote, as I have no particular preference."

5. Hinder; keep back; withhold.