It's mainly called Morning Tea by Office workers, who often get Afternoon Tea as well. In any case not much tea is drunk, mainly coffee and you're only allowed to smoke in designated areas, away from people eating
I work in the Construction Industry, we never call it Morning Tea, have always called it 'Smoko'. It's usually taken in the morning around 9.00 am, but depends when you started work and if you're on shift/night work etc. Outdoor workers rarely have an afternoon Smoko as work usually finishes by 3.00 pm as most bosses don't like paying overtime (over 8 Hours). Officially Smoko lasts about 15 minutes, but usually goes longer, especially if you are all having a good yarn (Conversation), and the Boss isn't around, and you get paid for it ^&grin
In Australia you are not allowed to smoke in any work place, including outdoors in most situations, yes they are officially pretty tough on actual smoking here. However the rules are sometimes overlooked when working outdoors and away from any building entrances etc.
As it's a break between breakfast and lunch it's usually a light meal of your choice, some guys eat Rabbit tucker (lettuce/salad etc), some have a Pie with Coke or similar, I've seen one guy eat an entire BBQ chicken, with a large bottle of Coke, but he was a big boy. Funniest was when some guy eat Two Pies with a Diet Coke, I said why effing bother mate.