There is some truth to that. One of the effects marijuana has on a person is to stimulate the appetite of people. Marijuana is given to AIDS patients to increase their appetites so they feel like eating. It also is known to reduce the sick feeling people get while taking some medications and chemotherapy for cancers. It is known that smoking marijuana makes you hungry.
Some myths are about addiction.
Not only do chronic users become physically addicted, they also become psychologically addicted. There are with drawl symptoms associated with stopping marijuana. And a need by some people to always smoke it. Remember that using marijuana relaxes you and makes you hungry. Stopping marijuana use causes the body to stop reacting from the drug and chemicals absent from the nerve cells causes problems.