I feel like I have. I know I'll be getting flamed for this post. I feel so bloody boring.
I have never touched a cigarette (okay, not completely true. A boyfriend once asked me to hold his fag whilst he tied his shoe. I yelped in fear it would burn me!).
I have never touched coke. Not even a tiny bit. My dad was very successful and confident and he did use coke as a recreational drug, so I'm told.
Have I missed out on anything? I know lots of people who do still take it and have taken it. My own mum used it to get her through a university degree. She stopped only because of me. And has never touched it since.
People who no longer use it but did always give me a similar answer along the lines of "Ahh, those were the days. I'd never do it now. But it was good".
I know most Mumsnet folk won't admit it perhaps but have I missed out on something? DH took it on the odd occasion when he was younger. He said it isn't worth it. Not really.
Stress is really getting to me at the moment and when I look at someone lighting up a cigarette, I always wonder if it'd be nice 
I said the other day "Oh you know what? I really fancy a fag". DH looked at me like I had two heads and laughed! Purely because I've never smoked. The same goes for alcohol (I don't like the taste), so I can't use that to unwind.
I'd love to feel 'invincible' like some people claim it makes them feel. Family are always doing it at any given type of party or celebration and I feel like the odd ball. I've never fitted into their confident EastEnd type persona of confidence and sheer sense of togetherness when having a dance or party. I always feel like the 'well to do' one and I hate it. I wish I could let go like they can.
I've never done any of these 'naughty' things because of fear. Fear of lung cancer, fear of a heart attack etc. The fag thing being addiction related, the coke thing being a worry from the get go since I know it can technically kill you from the first try.