Oh it had an effect for sure but I distinctly recall the instructor say it was a very low amount compared to what would come out of a full canister. Something like 1/4 the amount. It was a small tablet they put on a hot plate that turned into the gas which did really fill that small chamber quickly and the guy of course laughed at us all choking and shit when we had to take off the gas masks and kept repeating it was a very small dose. Full blast I am sure that shit is most brutal but that wasn't what they dosed us with in 72 at San Diego.