Always asking....again and again and again

My kids are constantly asking for things. Can anyone else feel my frustration?
I ask myself if I have conditioned them to do this. I don't give them things all the time, and I don't buy them things all the time. Is this a normal kid behavior?
For instance, EVERY time we get in the car they ask for a mint or a piece of gum. EVERY time I walk through the kitchen, they ask for a drink or a snack. Sometimes they are truly hungry, other times it is just habit. It doesn't help that our kitchen is the main traffic area in our house! I don't know what to do! I really try not to get frustrated and snap back that if they ask me one more time I'm going to throw all the gum, mints, candy, and other kid snacks in the TRASH CAN!

We are trying to teach them to have thankful hearts and not always ask for more. It's almost like it's a routine. Like every time we go see Miss Ellen at church they have to have a sucker. She has always given them one and now they think it has to happen. I keep trying to tell them to just go and say hi and make her feel like they want to see her, not just get the sucker.

Adrianna always has to have 2 of everything. If we give her one cookie, she is not satisfied until she has had 2. That goes with anything. She never asks for 3, it is always 2!

Any suggestions?
Our church is doing a campaign leading up to Easter to have no complaining. Hmmmm...I hope this blog does not sound like a big complaint...just a frustrated mom trying to find answers!