I'll 3rd that.
If they make flavors from home, I would stay clear. And if they're really cheap, I would stay clear. Food grade and USP-grade cost more. You get what you pay for. I hope you're good at reading between the lines. If you go back and read them again, I'm sure our walking-on-egg-shells, tip-toey posts will become crystal clear. Only because we care and we're concerned. It makes perfectly good sense since our lungs are on the way to recovery, blessed by this second chance, that we take full advantage of it and do everything we can to ensure that our lungs are not again polluted by dangerous chemicals. Hope that helps, dearheart.