For the moment.. but if because you were high and you're judgement was impaired that slightest bit.. you ended up killing a 6 year who was running across the road.. you would have to live with yourself for the rest of your life, knowing that if you haden't taken that risk that girl may still be alive.
Life is about choices.
You can make the choice to say, "No, I won't smoke that weed now because I have to drive home."