Is this a good argument for, IMO, authoritarian approaches to prevent people doing things which might damage their own health, though?
The same argument could be used to ban alcohol or fatty food and the comment that I've highlighted is a very dangerous way of thinking, IMO. Take it to its logical conclusion and we end up with very little freedom to do anything, once everything which is a potential health risk has been banned.
Or, if someone gets an STD through being not-so-careful, should they be denied treatment because it's their "own fault"? Should someone who falls off their bike due to a moment of inattention be denied NHS treatment? A very, very dangerous way of thinking IMO which must not be allowed to get into the political mainstream. People are not perfect. And perhaps the Government should be looking into why young people are messing around with nitrous oxide. Are they suffering from depression or mental health problems, for example, brought on, perhaps, by lockdown, austerity and uncertainty?
To me it sounds like an argument which diverts blame for the broken NHS away from the Government and onto people that don't live an 100% healthy lifestyle.