Some input please

When I was still living in Michigan a few of my friends (3 in particular) had quit smoking - or had they?One was only smoking when she went to the casino????Another one also smoked at the casino and claims to be a non smoker now for at least 20 years?????Another one took a cig from a friend and claimed she never needed it but just wanted to see what it was like to smoke again and then claimed she would not do it again????I watched when I was around them and no they never did smoke at home or when we went out to eat etc. but to be a non smoker does it not mean to totally not smoke again?The one who smokes at the casino only did tell me she bought a pack and had 5 and then threw them away.For me being a non smoker means not one puff.Are these people considered to be closet smokers or what?My daughters godmother had quit before I met her and I had no idea she ever smoked until she told me she used to smoke. She was the only one of the bunch who never did take a puff again. I never knew she ever smoked. I would have to think that the rest are still smokers when it suits them?