It is rare for a person to gain weight, as a side effect of inhaled steroids, even when used in a high dose. This would almost certainly be the case if you have experienced none of the other side effects of steroid therapy. You should not completely stop using the inhaled steroid, certainly not without
discussingDiscussing death with children this with your doctor. Doing so would place you at risk for sub-optimum asthma control. Your doctor might appropriately recommend a step-down in the dose of your Asmanex® Twisthaler® 220 mcg (mometasone furoate inhalation powder).
In the meantime, you should investigate other causes for your weight gain.