I could be the bearer of bad news I'm afraid...
I've never had a Hasselblad, but I have a computer chair, with a faux leather covering, so probably like your cameras covers. It came from a relative who was a smoker and did the chair let me know it!!!
I hate to say, but despite spraying with all sorts of cleaners and Neutradol type air freshener aerosols, the smell lingered on for about six months or so. Even after putting it outside to get some fresh air around it, when the weather was good, was to no avail. It even got put out of the living room on occasion as the smell was so bad at times and definitely more noticeable to a non-smoker like myself.
The end conclusion is that one just has to accept that the smell will go away VERY gradually and in it's own time.
Terry S