Should marijuana be legalized?

According to this article, public opinion on marijuana has changed.  The newer generation is more open to changes socially and economically than older generations in America.  Justice John Paul Stevens, although from the older generation and age 94, believes that marijuana should be legalized by the federal government.  Justice John Paul Stevens is retired now, but said that, "There isn't much difference between marijuana and alcoholic beverages."  Many people are starting to compare marijuana in its illegal state to alcohol during the 20th century in the "dry" or prohibition era.  According to this article, from 1920 to 1933 when alcohol was illegal, Will Rogers said, "Prohibition is better than no liquor at all."  Will Rogers knew that even during the period where alcohol was supposed to be illegal, he could always get a drink somewhere.  I believe that marijuana should be legalized so that laws can be set regulating it.  For example, alcohol has laws about not being able to drink and drive, not being able to buy or drink alcohol under the age of 21, etc.  If weed were to be legalized, there would be so many standards on it that it would be more difficult for adolescents to get their hands on it.  This would mean that more responsible young adults would be consuming or smoking marijuana.  With weed being illegal right now, it makes it easier for young adults and teenagers to gain access of it.