<human>: I am in a new start up for the past 4 months. I should begin by saying I used to smoke weed for 2 years and now have quit for 2 years. The urge of blazing up has gone and I have become bitter towards weed (my personal life suffered a lot due to it). 

My business partner and friend has been smoking since 7 years and is still deeply addicted to it (lights up around 5-6 times a day). He rationalizes it by saying he works better under high, but I've seen it to be false (could be confirmation bias due to my bitterness). Once high, he works, but the the quality is way lower than normal, and even our employees can notice it. I'm unsure of what to do as our progress is suffering a lot due to this. 

Looking for any advice you guys can give.

Condense the text into a few key points
<bot>: My business partner smokes weed a lot and works shabbily, want a way out without screwing up our business.