Individuals who suffer from depression may be more likely to abuse drugs as a means of coping with their mental state. This can put them at a greater risk of addictions that require therapy from drug abuse programs.

For example, a recent study published in the American Journal of Preventative Medicine found that depressed tobacco users are much less likely to give up their nicotine addictions than non-depressed smokers. The researchers from the University of California, San Diego said that the findings could help provide a window into why those with depression are more inclined to substance abuse.

For the study, researchers looked at records from calls to the California Smokers' Helpline. A total of 24 percent of callers suffered from major depression. After following up with callers two months later, researchers found that one in three non-depressed smokers were able to quit, while only one in five with depression were successful.

The researchers said that integrated care that provides substance abuse help in addition to mental health therapy could enable depressed smokers improve their mental state and kick their habits.