Approximately how much thc is in the urine after 3 days since smoking.also i'm 6 foot 1 around 210 lbs and drink plenty of water?

Depends: THC may be detectable in urine from 3-30 days or even longer, depending on how long and how heavily you have been using the weed. More body fat means THC will be detectable for longer period. For good health - Have a diet rich in fresh vegetables, fruits, whole grains, milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Drink enough water daily, so that your urine is mostly colorless. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco, alcohol, weed or street drugs in any form. Practice safe sex, if you have sex.