Many people smoke cigarettes, and it is a tough habit to quit, and I know this because I am still trying to quit. However, I have learned that if you take vitamins while you are still a smoker, you can keep your immune system and body safe from getting more and more unhealthy. Ever since I started taking vitamins (multi-vitamins, C, B12, and more), and I smoke, I feel better and feel like I have more strength to carry on my day.