study recently published in Obesity in December 2014 presents evidence that cannabis use may lead to lower rates of obesity.
Researchers used data gathered in 2004 from 786 Inuit adults, using the Nunavik Inuit Health Survey, and found that use was very common, with 57.4% of adults being cannabis users. They also found that cannabis use was associated with:

Full Article:
http://www.medicaljane.com/2015/01/09/new-study-cannabis-use-may-lead-to-a-lower-bmi/