I didn't smoke a joint until I was 26, now those numbers are reversed, so I have to catch up on it for all those times I missed. I first had the opportunity when I was 19 or 20, but I was so paranoid I was convinced the cops would be breaking down the door as soon as I lit up.
Edit: And that first joint was in a Christmas card, after someone I worked with found out the wife and I had never gotten high. We tried it in bed. It worked very