i have an xfx 6570 1gb gpu and overclocked with msi afterburner to max clock speed paired with a phenom ii x4 955 overclocked to 4.1ghz and i run dayz on high graphics just fine...
i am also a smoker and this would add character realness but would be a logistical nightmare imo....i dont go anywhere without my keys and always have my lifted jeep wrangler where i go as well, dont think that ill get a vehicle at spawn though :)