When i first started smoking, lungs we're all i would do, they got me majorly ripped but they also fucked up my lungs badly, it was soapbar too... thats all i did for like 2 years untill i wised up to what i was doing to myself.
Green in a lung is a different story, i think they can take you much higher than bongs or pipes because your getting such a big volume of pure smoke into your lungs in one quick sup, they're pretty harsh n nasty though.
Not for lightweigths