gravity bongs are great if yur looking for a good buzz, but if u do too much its really easy to get sick, i took 7 hits wit a gravity bong once, and it was way too much i usually take 5, and i got really sick and threw up so much that there was nuttin left in me to throw up (srry if im making u ppl sick) and my parents thought i had the stomache flu so i missed 4 days of skool, and i felt great the next day, so for 3 of those 4 days i just sat home getting high, so i love the gravity bong, i wanna use one right now wit the sprite bottle i just threw away so peace