[Vision]

Hookahs are shared between fiends. Its a communal activity, not unlike eating from the same plate/table in a middle eastern restaurant. Provides a bit of bonding.

Eating is a necessity of life. Getting high on drugs is not

[Extremely Extreme Extremist]

Getting high on drugs is not

Not your concern. Let Darwin worry about them.

[Alter Kaker]

Eating is a necessity of life. Getting high on drugs is not

While tobacco is a drug, I'm not sure that the buzz you get smoking it, even through tubes and water, could reasonably be called a "high." Out of curiosity, do you eat with another person, or always alone? Eating is a necessity, but for most of us, it is also a social activity. Hence taking someone out to dinner, which I can assure you isn't just about injesting the requisite calories, minerals and vitamins to sustsain life.