Article continues below advertisementDick Van Dyke celebrated his 100th birthday on December 13. The beloved Mary Poppins star recently shared the secrets behind his remarkable longevity, and they revolve around two simple choices: quitting alcohol and smoking.Article continues below advertisementSpeaking at a Vandy High Tea event at his Malibu home on November 30, Van Dyke reflected on his life choices and how they contributed to his current health. He revealed, "I smoked a lot, actually! I think I was probably in my 50s before it dawned on me that I had an addictive personality.