At the end of the day it's about personal opinion, to some it might help and to others its just another thing that poeple become so hooked to in a subliminal way that they want to fight for it.
I kind of have an idea of how marijuana is suppose to aid with people and particular conditions like Athritis and MS.
The brain produces a natural level of dopamine in the brain, dopamine acts like a relay between between neurons and protein receptors. It carries the signals from one to the other and back again.
In some types of people, they might have less receptors, or lower dopamine levels, this is where Marijuana increases the relays and can help stimulate regions of the brain that wouldn't have previously functioned so well.
(It's basically a method of increasing the chances of stimulation)
This means there are chances that the future will bring some pill rather than a joint to deal with these problems.
But for those people that smoke?
Well it's known that a person with their mind adrift with hyperactivity will suffer from feeling a lapse of energy. (They have a kind of alzhiemers, where their brain is burning off more energy than the rest of their body. So their brain says their tired, even though the body isn't really.)
There is also the problem of the dreaded Whitey (well thats one term), when a person becomes so intoxicated that their blood pressure changes making them go completely pale and giddy (possibly even nausiuous, and maybe even pass out.
Of course this occurs when people smoke too much of it. (through a bong)
Notibly, a Pot smoker is not someone you want to hang around if you can't afford to stock you fridge up with food. The brain thinking that the rest of the body is suffering energy loss due to it's hyperactvity, usually orders the person to order pizza.
There is a real bad side though to smoking pot, the TAR rate is way higher than even a cigarette, so more chance of respiratory ailments. (Courtesy of the BBC)
There is also question to Scitzophrenia caused by smoking pot, from the parnoid delusionary state of someone heavily stoned on something a bit higher than the norm. (Usually something green)
I don't actually smoke pot, and won't in the future. My past is a different story.