but you have to take into consideration that marijuana can be "consumed" in much healthier ways. How? well, eating and vaporizing cannabis (none of which will contain tar and smoke, things you cannot take out from tobacco).
The overwhelming majority of cannabis users smoke the drug. How does eating it reduce the level of toxins, anyway?
You could argue that tobacco's no so harmful because it can be snorted as snuff. That simply doesn't happen in mainstream usage.
Next, your statement of "the correlation between cannabis usage and certain neurologic disorders" lacks evidence. Consuming marijuana has an instant side effect, which is paranoia, and although it causes this while you are high, you do not remain paranoid afterwards. "But I refer to long term usage" you might say, well, this hasn't been proved yet. You can find that almost everything (articles, tests, etc.) that suggests (I repeat again, SUGGESTS) this "link" between mental disorders and marijuana has to do with the government (any) and their "War on Drugs", which, by the way, does more harm to people than good (but that is another subject).
That's why I said "correlation". I know that there has not yet been a proven link, hence my use of the word "correlation". I did not misrepresent any facts; it is known from studies that cannabis usage correlates to increased instances of certain neurological disorders in later life. People who smoke dope are more likely to get those disorders. This doesn't prove a causative link; it is still being investigated.
Did you know that marijuana can be used to alleviate nausea and some pain?
Yes, that's why I'm interested in the research being done into therapeutic, prescribed, regulated use of cannabis as a medical remedy. Curare, methadone and amphetamines have medical uses, that doesn't mean everyone should be able to buy them and use them as they wish.
I have known that drinking A GLASS (1) OF WINE a day may be beneficial to your health (don't know exactly what it does).
It goes beyond that; even a daily shot of spirits (whisky, etc) reduces the ocurrence of heart disease and heart attacks. As with all things, though, any excess is dangerous.

Curious, you dismiss the possible risks of cannabis and emphasise the possible benefits, but also downplay the possible benefits of alcohol. Not the most productive way to make a point. I prefer research and studies that are conducted in an objective manner, rather than beginning with a presumption and trying to find facts that fit it.

...And where I live, there is no "war on drugs", so the US government propoganda/campaigns/whatever are ineffectual here.