This is really nice and I like the simplicity of it. I think you could actually expand on your ideas here, and maybe add another stanza for each stage/emotion you express here. I just feel like it moves very quickly and if you elaborated a little on each section it could have more of an impact. I also think the last stanza verges into cliche with lines like "to the good times/to the bad times/to the times in between." You have already expressed this idea in a more interested way throughout the poem, so that line feels like you're just dulling down the concept of the poem. Great work though!

Some recos you can take or leave:  
"To the times in between" -> "To the between"  
Drop the "times" from the ending "To the good times;" so "To the good"  
"mediocrity" is too big a word and breaks the flow you form in the previous stanzas

You really capture the emotion here. I like the use of alliteration and repetition.

Anyone who has been through addiction knows how utterly spot-on this was. Damn. 

To the good times;  
every night  
underground  
invincible.  


To the bad times;  
screaming  
back and forth  
the masks come off.  


To the times in between;  
Motionless mediocrity.  
Time simply passes,  
But space remains still.  


To the good times;  
To the bad times;  
To the times in between;  
Without you,  
life is too unpredictable.  
With you,  
No one else seems to stay.  

1. https://www.reddit.com/r/OCPoetry/comments/82vcb3/walls/dveql4w/
2. https://www.reddit.com/r/OCPoetry/comments/82ynoj/cabin_pressure/dveq0cw/

An Ode to Addiction