Tener muchos humos

[ROBINDESBOIS]

When somebody has much smoke in the head , that means they think they are the centre of the universe, and we think they are idiots.
ENGLISH?

[Perikles]

He is very high-and-mighty.
He is very stuck-up.
He is all mouth and trousers.

(although more likely she )

[EmpanadaRica]

Maybe also 'He's full of it' or ' He's full of himself'.
Though the first one may also mean that someone is telling a lot of bs...

http://esl.about.com/od/f/g/ig_f_fullo.htm

Out of curiosity, I ran across 'hacer(se) humo' recently. Would this be something along the lines of 'to blow fumes' or more like 'to become/make yourself invisible/scarce'?

[ROBINDESBOIS]

According to the dic, you´re correct, but that´s southamerican Spanish.

[AngelicaDeAlquezar]

"Subírsele a alguien los humos (a la cabeza)" means that someone suddenly believe they're above anyone else.

@empanada: "hacerse humo" or "esfumarse" means to disappear in figurative language.

Buscamos al Ministro para que nos diera una entrevista, pero se hizo humo y nadie lo encuentra.

@Robin: nada de sudamericano. Americano. En México también se usa bastante.

[hermit]

When someone achieves a measure of success, a common caution is:
"Don't let it go to your head.".

hermit