trouble in cleansing your body of the environmental toxins including antigens that can make you sickalthough any amount of alcohol can harm your immune system experts say one should be safe if you drink in moderation this means one drink per day for women and up to two drinks per day for men according to the us department of health and human services we do not encourage drinking by any meansyou smoketobacco consumed in any form affects the mucosal lining of your respiratory tract smoking makes your body produce excessive mucous which narrows your airways and makes it harder for your lungs to clear out toxins when your body is working doubletime to remove the chemicals released by tobacco its ability to fight off infection is compromised not just this smoking also reduces the antioxidants in your bloodthe only fix for this is say no to smoking you dont exercise regularlyhave been skipping daily exercise dont be surprised if you end up sniffling and sneezing according to a review published in frontiers of immunology working out on a regular basis enhances immunity exercise increases both antibodies and white blood cells which allows your body to target the infection and fight it off effectively hitting the gym or just taking a walk can help kick the harmful stress hormones exercising slows the release of cortisol and adrenaline in your body protecting you against bacterial and viral illness according to the centre for disease control and prevention one should aim for at least 150 minutes of moderate aerobic activity or 75 minutes of intense activity a week