How do you feel about drug addictions in comics?

Over the years we've seen quite a few characters struggle with chemical addictions in comics. From Tony Stark's alcoholism, to Grant Morrison introducing the drug Kick in New X-Men to today where Daken has become addicted to a powerful new drug called Heat. How do you as a reader feel about it? Is it a sore subject that should be avoided? A lazy plot device? Does it hit home for you as a reader due to some of your own personal experiences? 
For myself, I've done drugs and seen people who have ruined their lives because of them. I think it's a topic that if done correctly can be interesting and even informative. 
Thoughts ComicViners?