i think that if you have never smoked pot, then you should not have an opinion on this topic. smoke a joint, and then we will see if you want it to be legal....
lets compare the effects against alcohol...
beer- makes you pee allot
weed- makes you eat allot
beer- gives nasty hangovers
beer- impares your judgement
weed- makes you not want to move but doesnt impare your judgment when you do move
beer- causes damage to fetus'
caffine- causes damage to infants (no coffee for mom)
weed- not yet known to cause damage to brain, fetus, or lungs (no marijuana related cancer to this date)
helps people with cancer, emphasema, aids, caterax, and tons of other sicknesses.
weed- stays in your system from 2 weeks to 6 months, depending on your metabolism
alcohol- stays in your system for about 24 hours
weed- if tested positive, the FAA will not let you become a pilot! You will not be givin a lisence for any drug crimes. UND's web site has the specifics http://www.aero.und.edu/Student-Services/medicalcertdrugpro.php3
weed is semi-legal in many countrys. In argentina i had a friend who got busted by the cops and took away his pipe and stash without any penalty (it is legal to have a small amount for personal consumption but not a large amount for sale purposes). and portugal has just made a law that when anybody is comits a heroin or marijuana related crime, they will not be givin a ticket but will be forced to go to rehab.
for lots of info on every drug (including caffene, nicotene, and alcohol) go to http://www.erowid.com