No one knows how safe sub ohm vaping is because no one knows how safe vaping in general is. Is it safer than cigarettes? Probably. Is it safe for 10, 20, 30 year usage? Likely not. The long-term effects are simply unknown. All anyone can do is speculate.
As for your vertigo, it could be from too much nic. If you're sub-ohming, you are going to need to drop your nic to at least 6mg (probably 3mg).
As for your vertigo, it could be from too much nic. If you're sub-ohming, you are going to need to drop your nic to at least 6mg (probably 3mg).