Advertising/Marketing and Psychology have a strong correlation. Because of this, many companies and marketing firms use the concepts of classical conditioning to make their advertisements successful. They often manipulate the consumers' emotions. Cigarette companies, such as Camel, are a good example of this. During the mid-1900s, Camel endorsed popular athletes to appear on/in their advertisements. One example of this was when they used Roger Maris to sell their product.
By using Maris, a successful professional baseball player, to sell their products, Camel made people think that, although cigarettes aren't good for you, you can still be successful even if you use them. This is an example of how Camel manipulated your previous emotions/views towards cigarettes. Obviously, this was an effective method because cigarettes are now a large part of our economy.
This is a strategic way of selling every product nowadays. I can't even imagine an advertisement that is not designed to make you feel a certain way, for you to feel closer to that particular product. Advertising indeed has very much of psychology in it, and people who are pursuing a career in advertising have to even take a class called the psychology of advertising. It's an interesting example of how most advertisements use classic conditioning.