I've had fungus gnats, whiteflies and mites a few times.
Once had mites and whiteflies at the same time, which was challenging.
Since being more careful about sharing gardening tools with my vegetables and any outside MJ plants, changing clothes/shoes when visiting my grows, and hanging a No Pest Strip in my garage, I haven't had much trouble.
I've had one minor whitefly issue, which I caught early and fixed by putting the strip inside my cab overnight, and that's it.
I'm still watchful though.
You can do everything right and still get the bastards, cause nobody told them you're doing all you can, but at least my garage isn't an easy mark.