One single Google search away:
Argemone mexicanaWikipedia wrote:Toxicity
The seeds resemble the seeds of Brassica nigra (mustard). As a result, mustard can be adulterated by argemone seeds, rendering it poisonous. Several significant instances of katkar poisoning have been reported in India, Fiji, South Africa and other countries. The last major outbreak in India occurred in 1998. 1% adulteration of mustard oil by argemone oil has been shown to cause clinical disease.[3]
Katkar oil poisoning causes epidemic dropsy, with symptoms including extreme swelling, particularly of the legs.
Why in heavens sake with such a reported toxicity in the seeds do you still want to know if you can smoke them?
There are a lot of good alternatives so if I were you, I would put these seeds aside and search for something more healthy.
Kind regards,
The Traveler