What types of common LEGAL Rx or OTC drugs have "negative side effects and do not prolong life"?

I'm doing a medical marijuana debate and have to refute the following statement.

"Scientific research reveals that medical marijuana has negative side effects and does not prolong life"

I thought comparing it to legal common drugs would be a nice touch. I know all will have negative side effects, but I was hoping someone could point me in the direction of OTC or Rx drugs that aren't intended to prolong life so much as improve the quality of life.

Also, if you know of any that are used as antiemetics for chemo patients, or are used for the treatment of AIDS wasting syndrome, multiple sclerosis , Alzheimer鈥檚, Nail Patella Syndrome, Pain, Chron's Disease, Anorexia, and/or Epilepsy.

Lastly, if you know of any drugs that are commonly recommended to those suffering the above ailments that have high dependency rates or lethal overdose histories, that would help too.

Thanks.

this is from a web site I copied months ago and really doesn't answer your question, I forget the web site domain. but still had it my files
Medicine:

From 1842 through the 1880s, extremely strong marijuana (then known as cannabis extractums), hashish extracts, tinctures, and elixirs were routinely the second and third most-used medicines in America for humans (from birth through old age). These extracts were also used in veterinary medicine until the 1920s and longer.
For at least 3,000 years prior to 1842 widely varying marijuana extracts (bud, leaves, roots, etc.) were the most commonly used real medicines in the world for the majority of mankind's illnesses.
The U.S. Pharmacopoeia indicated cannabis should be used for treating such ailments as fatigue, fits of coughing, rheumatism, asthma, delirium tremens, migraine headaches, and the cramps and depressions associated with menstruation.
In this century, cannabis research has demonstrated therapeutic value and complete safety in the treatment of many health problems including asthma, glaucoma, nausea, tumors, epilepsy, infection, stress, migraines, anorexia, depression, rheumatism, arthritis, and possibly herpes.
Deaths from aspirin (U.S. per year): 180 - 1,000 +
Deaths from legal drugs (U.S. per year) at doses used for prevention, diagnosis, or therapy: 106,000

any side effects are usually "negative"--right? maybe that's jmo...
with any drug you have to weigh the potential benefits to the potential risks. such drugs that come to mind as being non"life saving" would be amphetamines, oxycodone http://www.streetdrugs.org/oxycodone.htm & the like (Vicadin, percocet, etc, opoids in general), both of which can be pretty addictive.

"palliative treatment" by nature is meant to increase quality of life but not to prolong it. these would include pain meds, antiemetics, etc. thus, these drugs, like most, are helping relieve symptoms rather than prolong a life/cure an illness.

marinol is the legal drug in pill form that is based on the properties of cannibus. most mainstream docs would probably point to this as the way to go, rather than have a patient smoke a drug. sometimes the effects of marijuana smoking can cause injury - i would imagine - to someone like an elderly person (not getting their balance, falling, not handling the smoke in their lungs (coughing- which, hard enough, can crack a rib), etc.....)

check the national cancer institute for some info. they also have a toll free line - 1-800-4-cancer - they may be able to provide you with some fact sheets or something.