I think they're talking about medical uses of Cannabis, not
recreational.

--------------------------------------------------------

Scientists studying marijuana's potential medical uses have found that
it may help treat a variety of conditions.

Nausea
One of THC's medical uses best supported by research is the treatment
of nausea. It can improve mild to moderate nausea caused by cancer
chemotherapy and help reduce nausea and weight loss in people with
AIDS.

Younger people may find marijuana more useful as a treatment for
nausea than do older people - who may not tolerate its mind-altering
side effects as well. The prescription form, dronabinol, also may
produce psychological side effects that make it inappropriate for some
older people. Doctors generally prescribe several kinds of newer anti-
nausea drugs with fewer side effects before resorting to dronabinol.

Glaucoma
This disease - the third-leading cause of blindness in the United
States - is marked by increased pressure in the eyeball, which can
lead to vision loss.

In the early 1970s, scientists discovered that smoking marijuana
reduced pressure in the eyes. Exactly how the cannabinoids in
marijuana produce this effect isn't known. Scientists have discovered
CB1 receptors in the eyes, which may provide clues for future research
on how marijuana affects glaucoma.

Your doctor can prescribe other medications to treat glaucoma, but
these can lose their effectiveness over time. Researchers are working
to develop medications containing cannabinoids that can be put
directly on the eyes - to avoid the mind-altering side effects and
other health consequences of smoking the plant.

Pain
People widely used marijuana for pain relief in the 1800s, and several
studies have found that cannabinoids have analgesic effects. In fact,
THC may work as well in treating cancer pain as codeine, a mild pain
reliever. Cannabinoids also appear to enhance the effects of opiate
pain medications to provide pain relief at lower dosages.

Researchers currently are developing new medications based on cannabis
to treat pain.

Multiple sclerosis
Research results on the effectiveness of cannabinoids in the treatment
of the tremors, muscle spasms and pain of multiple sclerosis (MS) - a
disease of the nervous system that can cause muscle pain - are mixed.
A 2003 study found that cannabinoids significantly reduced pain in
people with multiple sclerosis.

Some scientists feel that more research may show cannabinoids useful
in treating MS. Marijuana may protect nerves from the kind of damage
that occurs during the disease. They also suggest that animal study
results, knowledge of CB1 receptors in the brain and users' reports of
decreased symptoms after using marijuana support this possibility.
However, others advise caution in using marijuana to treat MS, given
the modest therapeutic effects cannabinoids have demonstrated so far
and the potential of long-term adverse side effects.

-----------------------------------------------------------------------------------------

Not without risks

Though some doctors and patients suggest marijuana has a legitimate
use, the United States government disagrees. Federal law recognizes
marijuana as a Schedule I drug, which classifies it as one of "the
most dangerous drugs that have no recognized medical use." If law-
enforcement officers find you with the drug in your possession, the
penalty can range from a small fine to a prison sentence.

Along with the legal implications, smoking marijuana poses several
health risks, including:
Impairment of thinking, problem-solving skills and memory
Reduced balance and coordination
Increased risk of heart attack
Heightened risk of chronic cough and respiratory infections
Potential for hallucinations and withdrawal symptoms

Also, marijuana smoke contains 50 percent to 70 percent more
carcinogenic hydrocarbons than does tobacco smoke and has the
potential to cause cancer of the lungs and respiratory tract.
Marijuana smoke is commonly inhaled deeper and held longer than is
tobacco smoke, increasing the lungs' exposure to carcinogens.

These risks should be taken into account when considering the use of
marijuana for medical purposes. If you are experiencing uncomfortable
symptoms or side effects of medical treatment, especially pain and
nausea, talk to your doctor about all your options before trying
marijuana.

http://www.mayoclinic.com/health/medical-marijuana/GA00014

This is how I react to it as well, paranoid and hungry.  Fun times.