I do wonder if concentrate are easier on the lungs?
That may depend heavily on which specific type and form of concentrates you are talking about and also on the individual.
There are very many cases of people who struggled to tolerate vaporizing flower and experienced allergy and irritation symptoms. They switched to vaporizing rosin exclusively and found that to be a perfect fix for their situation and symptoms.
I believe that as far as the various forms of concentrate go, rosin would certainly appear to be very smooth and well tolerated by most. Other forms like BHO, especially depending on production methods, maybe harsher and more irritating but I have no experience just something I have picked up.
And then there are various other forms as well like the distillates which I have no knowledge of either.
Regarding your hopes for recreational legalization in the UK I'm with you and have been watching this scene of course but I can see this dragging out quite some way from here still.
The government are just being absolute swine pigheaded flamingos over this doing everything they can to bury their heels and resist progress and justice.
There is such a strong and increasing tide of momentum pushing for legalization on all fronts and this will only get stronger and more compelling with time. But they will continue to resist until there is no other option or it seems more beneficial to change stance.
If you follow @londoncannabisclub and @ukcannabissocialclub on Instagram, you will see the daily updates, studies, press propaganda, parliament activities, public pro-legalisation statements etc.
Fingers crossed, but dont get hopes too high or expect too much for a while. 2020? Maybe more realistic for some sort of recreational law modification, but you never know there could suddenly be a faster turn of events for all we know.
Or- we could still be having this discussion in 2 years time from now.
Edit- I forgot to say that in my own experience I recently tried rosin for the first time because I have serious allergies to everything that enters my body practically any type of food you name it there is a reaction.
I'm also allergic to vaporizing cannabis flowers and it has been recommended to me so many times to switch to rosin which on paper should be the answer.
However I could not tolerate the rosin at all and had a significantly worse reaction then to the same flower itself.
But this is just my own experience and I am a total freak when it comes to these things in the majority of cases I would strongly expect cleanly produced rosin to be much better tolerated and less irritating by most.
And that I’m picking up a @710Coils box this afternoon?** 
I’m embarking upon my maiden voyage aboard the VRod this evening! I don’t have a dedicated FP space atm but I’ll muddle through. I’ve got plans to build a small station to house it & my small glass stash. Having all the pieces of my “dream setup” will motivate me to get this completed. I just need to find the extra energy somewhere. 
And even if there were, our North American brethren pioneering this tech have shown us how quickly the investment pays for itself. And I feel morally obligated to use the VRod to its fullest potential!
Gotta echo that too, Lori was simply amazing!
would like to say...when first looking at everything flowerpot I was completely lost.went to flowerpot university———-> https://www.newvape.com/flowerpot/fp-faq
So once everyone else is taken care of, including the dogs, then I can play catch-up with you and the rest of FPNation! Whoooo!