I can see Brian stop smoking for Gus too. I think I have the impression that Brian would be smoking and taking recreational drugs less often after post 513 when Justin and Gus returns to the Pitts for good. He needed those when he was alone or depressed. But I just can't see him needing that once he gets his family back.
As for the beloved doodle, I smirked seeing your post because I use url_girl doodle as my icon and wallpaper too, even though I am against smoking. You can still tell the stick figure is Brian because of the unruly chestnut hair and the lovely eyes that says "I am so in love with my Sunshine". OK, I know, it's just 2 dots. But try staring at those 2 dots for a while and you can so see Brian's love there.