On smoking pot:
Pot itself does not have the same bad effects that smoking does. Unfortunately, a lot of people smoke marijuana in combination with tobacco, because non-dried(and thus more potent) marijuana will not light from itself.
On car driving: Perhaps pot can impair driving abilities, but that doesn't matter. Why not? Because it's the driver's fault to start driving when stoned, it's not the fault of pot. Drunk driving is also illegal, but being drunk(in private) or drinking isn't...
However, the whole "legalizing pot will lead to hundreds of secondary deaths": bull. Why? Netherlands. Period. Nothing of the sort happens, and you never hear anything(at all) in the news about it. Cannabis is in the news regularly, so are debates about it and studies that could show negative or positive effects ofd cannabis. Never do I hear anything about stoned driving, though.
On ingesting pot: Eat.it. That simple.
Furthermore, most studies that have been done with regard to marijuana tend to be biased or inconclusive. Especially when dealing with psychological disorders. This is mainly the cause of a lot mentally ill people taking pot to calm down and act normally.
Now, I will not say that those studies are incorrect, but from what I know, most of the bad effects stem from using pot a lot(really a lot), and doesn't happen with normal behavious.
But Blade Runner may be the example of why things like that may not be true, since he, as he has said himself, has gone through several years of extreme marijuana abuse, and yet suffers no ill effects from it.
Whatever the case, I will support the legalization of marijuana because I believe that it is one's right to choose whether to smoke it or not. In a free society, you should be able to determine what to use, not the government. When the use of such things makes you hostile to your environment(as alcohol can do), or is damaging for your environment, then it is another case. But this is not the case with marijuana.