I smoked for 45 years, having began at 11 years old-sneaking them. My parents did not smoke but my older siblings all did. 
I am a nervous sort of lady and nicotine has calmed  me most the time. Came down with COPD in my 30's but could not quit smoking. 
A month ago I almost died from inability to breathe and was rushed to the hospital. It was then I knew I could not ever smoke a real cig again. 
Took to vaping like a duck takes to water-don't even crave an analog. DIY, the whole bit. Use an Ego that I like a lot but know those smaller 
things don't work for me. May get a mod yet-not in a hurry-loving what I have.