Kudos to these student activists with NORML and Students for Sensible Drug Policy, who used this year's 4/20 "marijuana holiday" to convey the fact that marijuana is safer than alcohol. 

According to an article that appeared in the Washington State University newspaper, The Daily Evergreen:

About 30 students gathered on the sky bridge between the Lighty Student Services Building and the Glenn Terrell Mall Wednesda... with signs reading “Cannabis is safer than alcohol...

The same sentiment was also conveyed by activists just down the coast in Santa Cruz, Ca. From an article published by the San Jose Mercury News:

"Marijuana brings people together. I think its safer than alcohol. It is a medicine and you never hear of violence from smoking pot."