Smoking
smoked for 16 years.
been quit for 3 years 3 months and 9 days.
not like i am counting or anything.
some days are easy some days are hard.
i quit cold turkey.
but it helped that i fell in love with a woman (now my wife) who has asthma.
never would have kept her if i kept smoking.
and smoking is way to smelly a habit to hide.
good luck.