But researchers aren't sure whether differences are cause or effect of inflammatory disease.
The longer the use, the bigger the risk the user would become depressed, study found.
Study shows biggest improvements in people diagnosed between ages 50 and 64.
Study finds the popular water pipes do not rid smoke of heavy metals.
Marijuana use side effect could hold key in learning how to stimulate or suppress appetites.
It could be stridor, a treatable problem with the larynx.
Study found dust exposure poses health hazards.