I started when i was 13... since then ive smoked one bud a day. SOmetimes 5 buds. lol on 420... i loose count
and no those dots have nothing to do with weed... thats actually This focus thing with your eye, and how the image is distorted inside of your eye on the way to your brain.
Its sort of a warning sighn to shut your eyes for a couple minuets to temporaraly stop the oxidization process on your eye balls so the cells can regenerate.

MAn so much metabolism is actually used up by your eyes because every second so many cells on your eye just die. cause its like the only open exposed organ.