With all due respect,
@Liaa Smith, we DO NOT know that PG, VG and flavoring are not harmful when inhaled. As
@MudVaper stated, there have been no long term studies to show their safety. PG, VG and flavorings ARE considered generally safe when ingested, but long-term studies of their inhalation safety are lacking. As vapers, we accept the consensus that vapor is likely less harmful than cigarette smoke. Very few vapers are rash enough to claim that
vaping is 100% safe.