All good points, and I am very familiar with the impossibility of eliminating all variables but one in a life experiment like this.
but I am comfortable that the potential risk is slight, and I have read that my chances of remission are 66% according to some study I forget.
I am uninsured, so this actually represents a bargain. For instance my Advair inhalers cost $150 a month. The occasional ER visit is always expensive, and I can do it at the 2900 level. I reckon less than the cost of one year, and if it works it should work for five, on average.