But it does. Why else sell it for pain relief? They sell it in buds, super duper highs, etc etc etc. There IS a way to dilute it (CBD oil), but its a PITA and I don't want to deal with trying to do it myself. So....that little baggie my neighbor gave me that she grew herself will stay in my drawer because I don't want to smoke it.
Kaya, there have been many advances in marijuana botany over the past few years, such that they have learned to isolate the CBD (cannabadiol) and THC (tetrahydrocannabinol), two of the many canabinoids that make up marijuana.
In doing this they have created new strains that are maximized for either of them. THC-laden plants have the psychotropic effect you're concerned about, while CBD plants have no such effects.
You're probably right not to smoke the stuff your neighbor gave you, since unless she is an experienced grower she probably grew one of the common strains that contains a high THC level.
REAL medical marijuana is only available through a dispensary, and you'll need an MMJ (medical marijuana) card, which you can get from your physician (if you're in a state where it's legal, and your MD is on the list of approved physicians).
As for CBD oil - it can be purchased online and you can use a small portable vaporizer to "vape" it. The oil is available in several concentrations and flavorings, none of which need to be diluted.
ETA: just read your earlier post. The money aspect I can't help you with. Growing it yourself? Sure, if you REALLY know your stuff and can grow ONLY the CBD-rich strains.
Topical application? I believe that would help in such symptoms as nerve pain; it would also help with depression symptoms as well, since it is what is called a 5-HT1 receptor agonist, meaning it can help with depression and anxiety by playing a role in the serotonin pathways.