4g's is good for 2 people if it's your first time.

you might buy a quarter (7g) and just eat a couple of grams to begin with....then once you got the basic jist of what's going down, you can split the other 3grams.

My first time I took 4g's at once...then waited a couple of hours and took 3 more grams. It was great...Nothing will ever compare to that trip. I was tripping so hard...at one point I convinced myself that my hand had burned off, but no one had told me. Another time in that night, I was riding in a car...but I kept seeing this guy's face on everyone that i looked at....so I convinced myself that I wasn't actually riding in a car, but I was sitting at home with the guy that I kept seeing doing circles around me...trying to fuck with my mind. Crazy shit, but it was a blast...definitely an experience I will always remember. Everything was a cartoon, heh.