I'm a non-smoker but I do drink.Is it necessary for someone who is in Marketing/Sales to hav alcoholic drink?

I have decided to quit drinking,although I'm not a habitual drinker.It's maximum 2-3 times a month.The problem is I'm an Marketing & Sales Professional.Hence,I think situation may come up when one my prospective customer is invited for a party & he minds me not having drinks with him..