Question about being high on pot. Why?

when i smoke pot, my effects are my muscles feeling extremely relaxed (feels EXACTLY like a deep tissue massage), my thought process feels like channel flipping, i have this HUGE smile on my face that looks like the Joker's smile, and i can't walk in a straight line. I'm only asking because my sonter friends never said feeling a most of these effects. please dont tell me not to do drugs, im trying to get a legit answer. ive also been told by many "you can't hold you wee" ive been smoking for a year and i swear, my tolerance isnt kicking in