If youve ever noticed your lips getting darker after using a glossy lip product, youre not imagining it. Fragrance, flavoring agents, and even the shine itself can trigger irritation and intensify What Are VG And PG? PG and VG Base Make My Vape Got dark lips from smoking? Heres why it happens and how to fix it., Why Lips Get Dark:, Smoking reduces blood flow, causing dullness and discoloration., Nicotine and tar stain the lips, making them Do you know what you're vaping? Propylene glycol (PG) and vegetable glycerin (VG) are the main liquids in vapes. When heated, these chemicals turn toxic and aren't safe to breathe.