i would imagine they get you pretty fucked.

i've only smoked out of a bong (from the 3 choices), but i mean, they all give massive hits. i'd say the heirarchy of how fucked up they get you goes something like:

GB>Lung>Bong

unless you're an experienced bong toker, that is. i know some people who can take a hit that's twice as big as that of a 3-liter GB hit.

as for the smell...i'm thinking they'd be somewhere between a joint and a bong, depending on whether or not you try to cover it up.

im my experiences, i've found that a scented candle paired up with incense and a doob tube cover up pretty much all weed smell (unless it's a joint/blunt. just take it outside for those, man.)

i've never smoked a lung (yet), but i have a few friends who did a while back, and they were fuckin BLASTED when they called me.