If alcohol and tobacco are allowed, you have to allow marijuana. Personally, I'm a teetotaller who wants to ban alcohol (not for religious reasons, I'm an atheist) and tabacco, but I just hate it when I see so many on the right claim that marijuana comes directly from the devil's rectum, while drinking and beating their wives and crashing their cars and destroying their livers. Alcohol is far more addictive than marijuana, affects the brain in many more ways and you can overdose on it and DIE. Marijuana is a "Bit" addictive, but it's about the same level as an addiction to chewing gum or chocolate - some will get addicted to marijuana, but some people can get addicted to anything. The majority won't get addicted to it.
As for its health effects....... eh the jury is still out on that. One thing we DO know is that it is NO MORE harmful than alcohol. It still might be harmful - research indicates that excessive smoking of marijuana leads to severe short-term memory loss (but you have to smoke a lot of it, and the damage takes at least a decade to manifest).
There are a few people (VERY FEW) people who have taken marijuana once and have had mental breakdowns because of it. Again, I stress that this is an extremely rare reaction, but it is real and has to be taken into account. But then again, some people die when eating snicker's bars because of peanut allergies. Yet those are not banned.
I would ban it. But then again, I would ban many things, because I feel like I belong in the 1950's when it comes to things like sex and drugs. I'm a colossal prude and I absolutely love/support/appreciate the police (no sarcasm).
But if we allow alcohol (which is VERY addictive, bad for you and has caused much pain and suffering to many people), we've got to allow Marijuana. The only reason why people like marijuana is because the government was afraid of it, and went on a huge propaganda rage to demonize it. Now that the research has been done, revealling it to be no more deadly than a bottle of vodka, it should be legalized, but the government is afraid of looking stupid, and rather than admit its mistake, it would rather just deny reality. Plus, it's scare campaign worked too well, and now your nation and my nation (australia) is filled with middle-aged people who also think drugs were spawned directly from the rectum of the devil himself, and will kill you if you even LOOK at it. And to appease the people it frightened, it can't legalize drugs.
Marijuana WILL eventually become legal, it will just take, oh about, 30 to 40 years.
Note that I still think it should be banned. I think all recreational drugs should be banned. But Marijuana is a different kettle of fish to say, crystal meth or ice (which can seriously mess you up, believe me, I've see quite a few crystal meth users in the emergency room, all freaked out, assaulting doctors who are trying to help them).