My Hubby Had A Heart Attack Two Years Till He

my hubby had a heart attack two years till he has arelasp. The surgery he has his blocked were 99.9 blocked. they put int 4 stints. he as been doing ok but he has started drinkingj beeer again and smoking cigeraeetes. I hafe beeen told that is it only a matter of time he has another and this scrares the mess out of me. what dan i do. for him