Ok, so you are a stoner but not a hippie. Cadence gets it, they have made a subtle, dare I say classy, Chronograph watch. Notice the 4:20 mark on the watch face, highlighted in bright green (too bad there isn't a touch of purple as well). Now you and your other clandestine stoners can giggle at your next work meeting as you wait until 4:20 hits.
The Cadence 4:20 watch has a large 42mm stainless steel case with luminescent hands, a leather wristband, and is water-resistant to 5ATM. Yours for $195 here.