CHEMICAL WARFARE: Iron Soldier can use Smoke Cloud. If an opposing character begins its turn occupying a square containing one of these terrain markers, it must break away for movement purposes. If an opposing character ends its turn occupying a square containing one of these terrain markers, deal it 2 damage. Characters with the Armor or Robot keyword ignore these terrain markers.

Does this mean ANYONE NOT a Armor or Robot, MUST breakaway, or do characters with [] ignore breakaway rules. as smoke cloud counts as hindering terrain.

I'd say that characters that have IM:Ignore Hindering would still need to break away. A character that ignores hindering terrain for movement purposes does not ignore the actual smoke cloud token. Just the type of terrain that the token applies to that square.

Agreed similar to the Poison Ivy ruling:
http://win.wizkids.com/bb/viewtopic....328e70c#p21418

The character doesnt Ignore Iron Soldiers effect and still occupies a square that meets the conditions.