Alien, I was in the RY (TA recce) for the same period as your service. Ferrets and Saladins
at the beginning, CVR when Saracen was withdrawn. We never saw smoke (or No.36) grenades until either Crusader or Lionheart, then we were issued with at least one 'salvo' (8) per Fox. We never had opportunity to use them, so going through a National Forest our Dashing Troop Leader couldn't resist firing his off! Luckily no walkers nearby! As I remember at least two fired, but didn't 'smoke' - I volunteered to stay behind for a while in case they went off.
Talking of H + S, we took most of the grenades back (either ferry or container)
I had a nice little line in 'Testing rounds' - drilling out the filling, firing the ejection charge and connecting a small (Glass-lensed) Army tail light - just the right size - to the top.
Our RH PSIs took some back to BOAR for their Chiefies.
H + S? What was I thinking of? Ignorance is bliss sometimes, IF you get away with it!