During the Victorian era arsenic was known to be poisonous yet "Arsenic Complexion Wafers" were advertised in newspapers claiming that it would remove freckles and pimples. Yet no one in their right mind would argue preventing arsenic from being peddled is an infringement on free speech.
Furthermore, proving deceptive intent is not necessary under false advertising law. The deception of the advertisement is considered alone.
People who are opponents to laws like these on the basis of freedom seem to forget one of the fundamental tenets of it - that your freedom to throw a punch ends where my nose begins.