Alcohol does the same thing and yet that is still legal, so why should the standards be different.

Not everyone who smokes marijuana a lot is doing out of recreational purposes, some use it for medicinal purposes. Also, legalizing marijuana doesn't mean everyone will abuse it.

In other words the drug makes it easier/faster for you to lose sense of what is real and what is not.

One study found that "Regular use of marijuana can hasten the onset of psychotic illnesses. In fact, high-dose THC – one of the most widely studied molecules in the marijuana plant – has been found to cause acute/transient psychosis."

For example, they would have longer to focus on violent crimes or crimes concerning murders.

I agree! And many studies show tobacco is worse for you and it is more addictive.

If you use marijuana a lot you will build a tolerance to it, causing you to need more and more to feel this way. Soon you may be addicted to it.

One study found marijuana has 50-70% higher levels of carcinogens than tobacco smoke.

Legalizing marijuana would also let people have much easier access to it. This would make it more likely for more people to start abusing it.

Legalizing marijuana is not a good idea because it is very addictive and it would cause a more people to become addicted.This would happen because they would have an easier access to it.

Legalizing marijuana would give the police time to attend to other bigger crimes are that are more dangerous rather than focusing on catching drug users.