For a combination of health and environmental reasons, the import, manufacture, and sale of disposable e-cigarettes or vapes should be completely banned, and the sale of reusable e-cigarettes and liquids should be properly licensed.
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E-cigarettes have undoubtedly helped many people give up smoking, and it does appear they are probably the lesser of two evils.
Disposable vapes, however, appear to be ruthlessly targeted at children, with little or no quality control over the contents. There is an epidemic of young teenagers becoming addicted to nicotine and poisoning themselves with lead, other heavy metals, and carcinogenic compounds.
On top of that, the e-waste created wastes valuable resources, and poses a fire risk.