Late nutes during flower

So I've been wondering about this chemical smell that i keep getting after the last 3 harvest and couldn't figure it out. I was reading tonight about molasses and other nutes, when to, how much,.... Then i found this:
"In general, it is best to avoid providing your plants with a lot of nutrients after they reach the 6-week mark in the flowering stage. At this point, they are no longer growing stems and leaves, so they don’t need as many nutrients. It is especially important to cut Nitrogen intake. If you use too much near harvest time, you could be stung with an unpleasant chemical tasting crop."
Anybody been there and done that? And if so, is it still safe to smoke?

Lots of growers monitor the nitrogen around flowering time as too much nitrogen can intafear with proper flower production. Butive never herd of it giving a chemical ta ste, although it makes se nce