If two people sat at a table and one took alcohol and the other marijuan one is not more at risk then the other. However if you look at long term use of alcohol to marijuana they are in more danger with marijuana. Marijuana will eventually get old and the person is more likely to move on to harder more dangerous drugs.
Marijuana is at least as dangerous as alcohol because it causes lapses in judgment just as booze does. The difficulty is that studies with alcohol and its detrimental effects are more widely known. Since marijuana is supposed to be illegal, studies with THC aren't as common. Now that pot is legal in Colorado and Washington, perhaps scientists can study what pot does with more certainty.
No, Marijuana is not more dangerous than alcohol. Marijuana has a calming affect, where as alcohol can and has lead to many fights and car crashes. There are no known reported deaths from marijuana while alcohol kills thousands every year, from liver disease, drunk driving acts and violence, like fights, shootings and stabbings.
Marijuana is far safer than alcohol, a substance that damages almost every part of the body and is both physically and mentally addictive. Marijuana is detrimental in excess, as are many things, and I personally avoid it, but at the same time, its certainly less harmful than alcohol to both people and their families.
Marijuana is not more dangerous than alcohol. Marijuana is a naturally growing plant and is not man-made. There seems to be no negative effects to using marijuana versus those who use alcohol. Also alcohol can impair judgment and slow your reaction times. Drunk driving is also a factor in alcohol that is not with marijuana.