one application of eagle 20 in veg will solve your PM problems forever. Anymore, the only time I need to do this is when I bring in a clone which doesn't happen much.

It's non-organic, but it's also non-mobile, so if you only use in veg you shouldn't be getting any chems in your smoke.

you can get a big jar on ebay for ~50-60 shipped and that will be enough for the rest of your life. It's something like a 1/4 tsp to 2 gallons if I remember correctly. So, buying a repackaged ounce or two is enough to break the cycle - by spraying everything in veg once now, then once the day before you flower...