Show me the evidence which you based your claim that no people in the USA died of cannabis in 2008. Or were you making it up?
I would prefer to base legal decisions on more than a 'feeling'. Remember, "the law is reason free from passion".
The LD50 of THC is so ridiculously high that you'd die of carbon monoxide inhalation long before the active ingredients of cannabis killed you if you tried to smoke that much (see below). In reality you'd be passed out on the couch before you did yourself any serious harm. In contrast, it's not extremely difficult to actually drink yourself to death. The long term effects of excessive drinking are more significant, as well. Not to let weed off - it's worse for the lungs than tobacco, but at least very few stoners smoke as much as a hardcore nicotine addict.
I find the zero death statistic quite suspect though. I'm sure more than one stoner passed out and burned the house down or drove off the road.
Obligatory wikipedia quote:
One estimate of THC's LD50 for humans indicates that about 1500 pounds (680 kilograms) of cannabis would have to be smoked within 14 minutes. This estimate is supported by studies which indicate that the effective dose of THC is at least 1000 times lower than the estimated lethal dose (a "therapeutic ratio" of 1000:1). This is much higher than alcohol (therapeutic ratio 10:1), cocaine (15:1), or heroin (6:1).