I noticed many times that the aroma of Latakia is most prominent upon lighting a fresh packed bowl and that some Lat heavy blends tend to get less tasty while smoking. That phenomenon seems to be weakest, if I pause some time from smoking english mixtures. I've even experienced blends becoming almost tasteless towards the end of a bowl. Something I do not observe with VA based tobaccoes. In fact, the sense of smell (which is also responsible of taste) has the property to get accustomed to certain aromatic molecules and blend out the smell a phenomenon that physiologists call tachyphylaxia or olphactory fatigue. It's something that those who wear cologne may well know (the fact that you can get anosmic to the cologne you wear with the risk to put to much of it which will harass people around you who are not blind to it).