According to statistics from the American Automobile Association, compared to alcohol-only users, drivers who use marijuana and drink are far more likely to report such behaviors as:

Speeding on residential streets - 35% alcohol only, 55% both.
Aggressive driving - 28% alcohol only, 52% both.
Running red lights - 32% alcohol only, 48% both.
Texting while driving - 21% alcohol only, 40% both.

Remember, driving with marijuana in your system is CRIMINAL OFFENSE. It doesn't matter when you last smoked, or if you have a medical marijuana card.