Ok thanks. :-)
Probably no-one has ever thought that everyone enjoys exactly the same things. It's like if you're arguing with someone and the other person says "2+2=4" apparently to support their argument, it would just make you wonder what their argument is, that they bring in 2+2=4 as supporting evidence. It's still puzzling why bring that in, but it seems you have an unusual idea of subjective/objective, as the other commenter has pointed out. But I don't think that's the main issue here..
Trying to understand how people can say "there's nothing good/positive about smoking" :
It seems that - as very often happens in philosophy - there is an equivocation[0].
In one sense, the statement is false (the one I hear, and the guy who said it's a silly thing to say):
There's absolutely nothing positive about smoking (including the smoker's pleasure)
and the other is true but trivial (the one you said you meant when you clarified) :
There's absolutely nothing positive about smoking (not including the smoker's pleasure)
- apart from the smoker's enjoyment, there's nothing good about smoking. But (like ice cream) what are these other good things supposed to be? They are done for enjoyment.
You (and Crockford in that video) say it like it's a hard-hitting substantive thing to say, bemused at how it's not generally admitted. I think it seems so because of this equivocation.
[0] "an informal fallacy resulting from the use of a particular word/expression in multiple senses throughout an argument leading to a false conclusion" - wikip.