Smoking a blunt after being clean for years addiction won't be a problem, how many days will it take for a drug test to come up clean after doing so?

THC: If by blunt you mean marijuana, a single joint used only once should clear out in a week or so. If you are near other people smoking week your test could be positive even if you did not smoke it. For good health - Have a diet rich in fresh vegetables, fruits, whole grains, low fat milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco or alcohol in any form. Practice safe sex.