what even is the difference between smoking real weed and boof

im high and this thought just came to mind i feel like ive smoked “real weed” for so long and today i tried a new disposoable and one hit im fried but it feel like im shaky and i got this feeling in my stomach but these past days ive smoked i didnt have that feeling today ? maybe i just smoked weaker weed and now i tried the real or stuff or maybe i been trying the real and tried the fake stuff today which has stronger effects ?mm idk what even are the effects of smoking a fake weed pen? possible to od off a fake weed pen?