SalesHQ

When I started out at a new company, I was still learning the ropes. We had a company party and my supervisor said, "Make sure to pay extra attention to William, he's one of the biggest clients in company history. Oh, and don't call him 'Will', he hates that."

So I sat by him at the party and we starting chatting. He was friendly, but very aggressive. You can tell that

Wow....crazy story...it tasted like grape????   I used to do it in college too until I had a few scares.  If you don't feel comfortable you should never put your health at risk for some douche bag even if he is important....so not worth your brain cells. 

I understand that feeling of pressure though when you want to give off a good impression.  I think if you have to keep seeing him socially you can just mention that it make you sick and you cant do it anymore.  I don't do drugs anymore and when people offer them to me know at parties I just smile and say, "nah I quit".  If they feel that you aren't judging them then it ends up being chill.  If they see you look revolted then it might bother them.

I had to rescue a female sales associate who ended up at lunch with a client and only his car. He would not let her return to the office.  She got away from him with a restroom visit excuse, and called the office in a panic.  I knew the guy was bad news.  No client or sale is worth having to put up with that type of BS.  Since the client also knew me, I later called him and made him feel pretty bad about what he had done.  We didn't lose the business, but I was perpared to go to the boss and take the responsibility for losing it if we did.