Thanks for the replies, everyone.
I was trying to take Steve's advice on working on yourself to see improvements in other people, but I may have been doing it wrong. Holistic Star, I never thought about the situation that way. I'm not sure what the addiction of mine could be, but I think it might be the internet as I do spend a big bulk of my time online...
I don't want to change anyone against their will, which is why I figured doing it indirectly was a great idea.
NickW, in my case I want to change my brother in his smoking habits because it's unhealthy. There's no benefit at all to smoking and he knows that, and he's expressed a desire to quit but just can't seem to do it. I'm not annoying him about it or forcing him to quit because I recognize it is his decision through and through, which is why this indirect approach of working on yourself and seeing others change accordingly appealed to me.
By the way, my brother does not smoke in the house, he smokes outside the balcony.
I'm going to lessen my time on the computer and see what happens.