The AIP poster is so great.

I love how AIP promoted their films in such a lurid way. Always promising so much more in terms of exploitative content than what the film actually delivered (such as in their infamous ad campaign for Godzilla vs. the Thing). It was false, dishonest advertising in many ways but it was fun, good natured false advertising, if that's even possible.

The Smog Monster poster reminds me of AIP's later Squirm poster (later seen on the wall of John Travolta's sound mixing lab in DePalma's Blow Out) in its tone and style. It looks like same artist may have worked on both.
image