Interesting, but is advertising really free speech?

I mean lets face it, all spam is a sales pitch for something, whether its an adult site or a new ipod or such. So if you assume that spam is protected under free speech, why then is advertising regulated? Would not any regulation on advertising, whether it be in print, radio, or television be a violation of the same constitutional amendment?

Just curious btw, as I stay out of political type discussions...:coffee: