Another angle to consider is that of paternalism. Many grown-ups have worked damn hard at preserving/creating belief systems that they feel comfortable with and expert about. They may use terms such as "wet cement" for your brain, because they have invented (or someone they prefer to believe such as neuroscientist has invented) theories that suit their ends. Remember, a developing brain needs to develop in order to be able to understand, errr, grown-ups ways of understanding reality. In other words, they feel they know what's best for you.
That said, some of the established reality is quite OK, and indeed we wouldn't have psychedelics like LSD if it weren't for some of the existing belief systems (however, every Government that I know of on earth is attempting to completely prevent the use of LSD by people not licensed to use it, which which is almost everybody, and certainly you and me!) and we do have to be pragmatic and "pick and mix" what we want from the existing hegemonic and consensus reality into which we are born and educated.
ANd of couirse, just like driving, scuba-diving, crossing the road etc., there are potential pitfalls, and straying too far from the orthodox ways will result in exposure to ridicule and in extreme cases, persecution. Why can people get put in jail for life for making Acid or giving some to a mate, and potentially 7 years for possession (in the UK)? They don't like it and will abuse your human rights to liberty if you mess with them. Funny that there's so much noise being made amongst the adult population about the relative benefits/disbenefits of decriminalising MDMA or Cannabis - but has anyone dared to campaign for the legalisation of LSD?
So don't be surprised if you attract disbelief about, or even condemnation for your drug habits. Equally, try not to be too bothered about it either. Most of the (adult) idiots that I encounter in my life have never tried psychedelics, and (un)surprisingly most of the really nice people I know have, or are totally tolerant of the idea. And I do mess around with all sorts of people from all walks of life.
Rant over
