Looks like Hobby Lobby just got some smoke cartridges. Are these the same as that industrial supply place linked earlier?
http://www.hobby-lobby.com/atricks.htm
Regarding AMA...
The safety code isn't very clear about this type of pyrotechnic. I've highlighted the part that makes me think smoke is not a problem.
7) I will not operate models with pyrotechnics (any device that explodes, burns, or propels a projectile of any kind) including, but not limited to, rockets, explosive bombs dropped from models, smoke bombs, all explosive gases (such as hydrogen filled balloons), ground mounted devices launching a projectile.
The only exceptions permitted are rockets flown in accordance with the National Model Rocketry Safety Code
or those permanently attached (as per JATO use); also those items authorized for Air Show Team use as defined by AST Advisory Committee (document available from AMA HQ). In any case, models using rocket motors as a primary means of propulsion are limited to a maximum weight of 3.3 pounds and a G series motor. Note: A model aircraft is defined as an aircraft with or without engine, not able to carry a human being.
Since a smoke cartridge is just as permanently attached as a JATO cartridge wouldn't it fall into the same excpetion? At the very least couldn't I just say that these are a very weak JATO device?