Hot Shots no pest strips worked on my thrip issue, and within a couple days. They cost about $7 each and are sold at hardware stores. The life cycle is supposed to be about 5 days, I left them out for 10 days just to be safe. I have heard mixed reviews regarding the safety of using them, I definitely wouldn't use them in a bedroom closet grow or something. But for a closed off basement grow, seems safe enough. Spraying a buncha big plants with anything is a pain in the ass. Any bug problem arises I just put them up for 2 weeks and then they are gone. Worked for 2-spotted mites also, though in some areas I beleive mites are resistent.
You want to turn off your exhaust fans because you have the let the stuff build up in the air. I've had luck with hanging them on the front of my oscillating fans. It has kinda a hint of a smell, so you can tell when it is in the air. I've heard people complain about skin sensitivity from being in the room with them, and my wife has complained a bit about itchiness when she is around them too long. I just minimize my time in my grow while I'm using them. I hang about double what is reccomended for whatever sq footage it says on the package. They are supposed to last for months, but I use them for much less than that. If you use pesticides at less than full strength, that is what would help a bug develop a resistance to it.
I can say I have used them, and I'll work around them for an hour or 2 at a time even, though I don't think that is a great idea. I have done research and as far as poisons are concerned, all the risks seemed within reason to me. Probably want to keep any animals away from your grow area too.