That's true, I think Vaping is still not that healthy for your lungs. Fair enough about burden of proof. I found one that supports and one that opposes the arg

That's true, I think Vaping is still not that healthy for your lungs. Fair enough about burden of proof. I found one that supports and one that opposes the argument: Kind of supporting, it says it is complex to evaluate the gateway hypothesis: https://doi.org/10.1080/09595230500126698 https://doi.org/10.1080/09595230500126698 Opposing: https://link.springer.com/article/10.1007/s11292-021-09464-z https://link.springer.com/article/10.1007/s11292-021-09464-z