The enjoyment of a great meal shared with good friends is difficult to match. The secret thrill of making it through a meal knowing you didn't reach for a smoke, have an unnecessary second helping or bite your already painfully short nails will only enhance your experience.
Do expect that your urges might be stronger at different meal times. Recognizing when your urges are strongest will permit you to take the action that you need to defeat your urges during those times.
Do vitamins protect against heart disease? Surprisingly, to this date few well-designed studies have been done that will permit any correlation between the intake of vitamins and heart disease. Many claims have been made, especially for Vitamin E, but the data did not withstand scientific scrutiny and was mostly anecdotal. Some observations over 30 years ago have suggested that Vitamin C may be important in preventing fatty-cholesterol deposits in arteries.