I havnt tried pot and don't plan on doing it. However whoever said that thing about the overdose is definitly wrong. I'm pretty sure its impossible to OD from marijuana, youd die just from the smoke first (like doing 10 cigs at once and dieing from lack of oxygen or something). So unless you hold your breath and done breath while smoking, you wont die from it. Alcohol is wayy way way more likely to kill you then weed is.
Another stupid thing is the whole gateway argument. It's so stupid because alcohol is a gateway as well. You dont go from sober to a heroin addict, you do alcohol/marijuana then go from there. The gateway thing is a stupid argument purely because of this.
Also getting baked for school is just plain old irresponsible, you wont learn well and you'll fail out.