Problem when doing inventory control and item?

I want a /smokeweed, but I am not able to set the execute command to set the durability of the cigarette lighter to -10 every time you run it and remove 4 sapling and when not have this items: Sapling cigarette lighter and an error message, and also wanted to teach me put delay, and when the player had these items in inventory, he received the effect of confusion and hunger! I hope you can help me, not me *** therefore are beginner!