You run a library or a vape store !!! If they spend all the time reading, and not buying you will be running a museum . Get your people to talk to the customer and get them involved !!!
Plus the longer you can keep someone in your store the more likely they are to decide to buy something else they weren't planning on purchasing. Also, they might see an ad for something from another vendor that they really want and you happen to carry it for a similar price and buy it from you.