Making things illegal
Making things illegal (or making only the crippled versions no one wants legal) always works.
Nobody dies from heroin now that it is only available from criminals. We should learn from this example especially in relation to products that appeared to be pretty harmless in the first place.
It may turn out that it's easier to chase-the-dragon than to buy 24mg e-juices but there couldn't be any unintended health consequences. We can just make unintended consequences illegal. Then they will never happen. It all makes perfect sense.