Firstly, FD, I apologise for any sarcasm. Of course your opinion is as valid as anyone else's. Although to be fair, you were the one who suggested that only those with first hand experience should be posting
OP, I have been thinking about my use when I was getting dinner on the go, and the reasons why I stopped. I was a 'social' user, but it was fairly frequent use - a couple of times a week perhaps. Sometimes more, sometimes less. I never took it during the day, to 'help me get through work' as some people I knew did. I would take it when out clubbing & pubbing with my friends. The vast majority of people I knew at that time used cocaine in a similar sort of way.
I did start to enjoy it less. It got cut with more rubbish, I would throw up a heck of a lot more when taking it, I would have headaches for a day or two afterwards (really thumping, cracking headaches). One time I remember thinking I was going to have a heart attack. Think I was about 26 at the time. Can still remember the feeling now. I still took it though. Then, at 28 I met DH. He is the last person in the world who would take/need coke - he's always on a natural upper, is super fit & sporty and can talk for England He knew I took it (never when we were out though), and although he never asked me not to, I knew he respected me less for doing it and really didn't like it.
So, after a few months of dating, I made a decision: to stop it altogether. It was absolutely the right thing to do and I know that DH really respected me more because of it. I got huge amounts of pressure from some of my old friends to continue with it - no-one likes to be on coke alone (one of the side affects is paranoia), and eventually I cut off some friendships because of that - we only had coke in common if you like.
So, yes, you can use it regularly and stop. I did because of DH and because of my health. And because of my bank balance. And for my sanity. There are a hundred other reasons I could list now too