It could be a few things man... it could be that it's shitty weed (schwagg)... in which case I see why you're smoking a gram at once or more.... but when it's good bud you'll get fucking ripped as hell quick as hell... I smoke everyday multiple times, but every bowl I smoke gets me ripped.... a lot of it has to do with the quality of the bud.

It can also depend on you're mood... if you're in an energetic, happy mood before smoking, chances are you're going to have a happy, giggly high. If you're somewhat stressed or depressed, chances are you'll feel a nice weight off you're back... but it will be a completely different type of high... I personally zero my hits when I want to get stoned stupid.... something about the lack of oxygen in your lungs and amount of thc in your bloodstream gets me higher, quicker. I don't know what else to tell you man.... , but at least every high is usually pretty damn awesome (unless you get busted by the pigs... that would be a major buzz killer, lol)