my experiance is that every strain reacts differently to different levels of humidity, bigbud for example hates high humidity-mold is then only a blink of an eye away if ti goes above 50%, as with white widow. different game with some "tropical" sativas, they can stand high humidity and prosper in such climate well.
the other thing with high humidity is that it attracts mold in general and that again is on of the mayor tools of the prohibitionists to lobby against us since we suppositly damage real estate with our grow due to mold in every grow... ain't true but the folks that never grow their own don't know that. so keep that in mind growing ladies and gentlemen