None yet, that I know of. I've been vaping for one month now. I've been passing out cards for a local store. Over 50 so far. They just told me they would give me a 10% discount for anyone who mentioned my name as a referrer. Should have told people to do that from the start. Lol. I just wanted to spread the word to every smoker I know. Most of them have indicated their intention to go in for some free flavor sample vaping sessions, and possibly make a purchase on their next payday. That's how I got started. My wife and I spent over an hour, trying out about a dozen different flavors. We told the staff that we would be back in a week, to get our starter kits. Now we are on a first name basis with all of the employees, and take them fresh baked cookies, and bread. I've also notified all of my e-mail contacts, facebook friends, posted on pinterest, and phoned everyone else I know, out of town and offline. Time to start converting random strangers. Several have already approached me, when they saw me vaping.