Even if you don't lose weight, your body will eliminate THC metabolites, but on the average overweight people take longer than a person with the same smoking history who is at a normal weight or skinny.

Fat burners would work if they actually helped you burn fat. If they worked, this country wouldn't be so obese.

Diuretics are never recommended. If people are going to dilute, most of us recommend following the volume amounts in the dilution sticky and not try to add diuretics because they are unpredictable for most people and they can be tested for. With your valid prescription, you should take it as prescribed.