Typically, Cannabis and driving ARE safe. You'll most likely drive slower under the influence of marijuana. It's definitely safer to smoke pot and drive than it is to be sober, talking or texting on a damned cell phone and driving.
Don't drink alcohol when using marijuana. . .and THEN drive-that's a negative there.
Look, everything you've ever heard in the mainstream media your entire life has been either an outright lie, or a half truth meant to manipulate you. Remember that nugget, my friend, and live long-and prosper.