Researcher Sonja Lyubomirsky has examined this set-point:

A full 50 percent of our happiness set-point is due to genetics. 10 percent is affected primarily by circumstances like where we were born and to whom. 40 percent is subject to our influence.

Certain pleasures are more prone to hedonic adaptation. These pleasures can lift your mood quickly, but their effects can be short-lived. You may also get used to them fairly quickly. For example, If you have the same meal every day, you may find it to be less enjoyable by the end of the week. This is also true for fresh flowers or listening to your favorite song.

Gratifications, as well as activities that give a strong sense of meaning to us, are more immune to the effects of hedonic adaptation.

• Make sure you include several pleasures throughout your day. Get a cup of coffee or call your friend.
• Alternate your pleasures. This way they always feel new.
• Make time for your hobbies.
• Find time for meaningful activities.
• Savor your positive experiences. Keep a journal and write about three things you enjoyed every day.
• Take note of your happiness levels. Make time for whatever you can do to lift your mood.