You don't smoke weed, you prolly smoked a joint or 2 here in there in high school "weed head" common.........
Marijuana is not addicting whatsoever, I can go cold turkey any time I want without any cravings...... why????? Because weed takes 15+ days to clear your system giving your body a steady release of the drug out of your blood. Unlike narcotics, ciggarettes, and alcohol which are depleted in about 1-3 days. Giving you a instant craving to bounce back and relapse.