It's good that you recognize ways to improve your health and put it into action. It's not easy but taking small steps is a good practice.
I can relate to the cigarette addiction, and am the type that likes to keep that extra pack at all times for the same reasons you listed above, which is an indicator of a strong addiction.
I've been cutting back on coffee and replacing with tea and have noticed improvements to my health as a result.
Maybe trading those sugar drinks for tea will help. Don't be hard on yourself if you relapse on the sugar though, it's a tough one.