I try to keep healthy quick snacks in the house such as a bag of baby carrots or oranges.
Microwave popcorn is another good alternative.
I don't keep chips in the house unless we're having company and it will all be eaten. If it's not there you can't eat it. If I am craving something sweet, I reach for a glass of fruit juice over chocolate or candy. Just as sweet, but low calories and good nutrition. If I want salty, I go for a good tomato juice or something similar.