(CNN) -- Smokers looking to quit often use either a medication named Chantix or nicotine patches, hoping it will help reduce withdrawal symptoms.
But a combination of those two methods improves the odds you'll quit smoking on the short term, according to a study published Tuesday in the Journal of the American Medical Association. The study was funded by the companies that make Chantix and nicotine patches.
Researchers randomly assigned 446 smokers to either take Chantix and a nicotine patch, or Chantix plus a placebo patch. Treatment continued for 14 weeks.
Twelve weeks later, 55% of those who took both medications were still not smoking, compared to 41% of those on Chantix alone.
After six months, the numbers were 49% and 32.6% respectively.
The researchers also found a greater incidence of nausea, disturbed sleep, skin reactions and depression in the combination group. They say safety and long-term efficacy needs to be assessed by further studies.