thymol [SEP] i didn t see that this product had active vapors of thymol before i purchased it when i opened the individually wrapped pod i got a strong whiff of it it wasn t a good smell but want too too bad until it started to irritate me i was coughing while still in very close proximity to the toothbrush holder i put it away and i was fine i recommend opening this away from sensitive noses and in a ventilated area if you have asthma