Diet Soda vs. Guitar

I amaze myself. I still haven't had a diet soda. It's been 3 weeks now. I felt mighty tired this morning but just drank a little water and moved on with my day. It was my own fault because I stayed up until 1a.m. researching guitars. Did I mention I decided to take the money that I was using on diet soda's and put it towards guitar lessons? Does anybody have an acoustic guitar they are no longer using? You could really help me out because I realize learning guitar is probably costing me a little more $ than my diet soda addiction. Learning to play the guitar is certainly better for me and my family than drinking diet soda's to my hearts content. Right?