A new UK study has found that couples who commit to quit smoking or to lose weight are way ahead in success percentage than those doing it together.

Success rate of women quit smoking with their partner stopping at the same time was 50 percent, compared to only 8% whose partners still smoked. Just 17% had success kicking the habit if their partners were non-smokers.

Similarly men have the same success rate if their partner made the same change.

“Now is the time to make New Year’s resolutions to quit smoking, take exercise, or lose weight. And doing it with your partner increases your chances of success,” lead author Sarah Jackson said in a statement.

3,722 couples over age of 50 have been studied by the researchers from University College London, as part of a longitudinal study.