Both honesty and lying are tools. You choose how you use them. Whether to benefit others or to take advantage of others is a choice you make.
But there will be situations where the tool of honesty wont work, and if you walk into those situations having convinced yourself that lying isn't a tool available, then people who don't think that way will be better prepared than you to handle those situations.
Basically be aware where lies can be used. Don't just dismiss it totally as only useable for evil.
During Hitler's rise people like to point at the Honest folk who stood up against him like Carl Goerdeler, Dietrich Bonhoeffer. But there were people like Wilhelm Canaris who lied day in day out and did all kinds of damage and saved a whole lot of lives.