Why do i sober up so quickly after smoking ?

Lately i find myself smoking multiple times a day because im trying to get high again dont get me wrong the herb is all gas it be having me feelin good and all except not for long & ik its me bc before i could smoke a blunt and be good for the day now it takes me more than one and im goin broke ive been smoking for a while now nonstop and i see how people say they just dont get high anymore and its like i still get high but it just fades quick and ik if i smoke 1 blunt it wont last long so i usually have to spark 3 or 4 blunts a day or sometimes more (depending on how my money looking ) just to actually feel high af