when i use a lung similar to a gravity bong

usually 3 full lungs fuck me up and i only put a lil bud in each time
LilG716 Reviewed by LilG716 on . Gravity bong.. I made a Gravity Bong and me and 3 other friends are using it tomorrow. I was wondering how much weed we're gonna need to get pretty stoned. Any estimates? This is assuming we're hitting it correctly. From what I hear it really doesn't take much cause the hits are so hard. Rating: 5