Smoking is glamorized.
Throughout the series, many of the characters smoke cigarettes, and honestly, they kind of make it seem "cool." Emily's boss, Sylvie — who is essentially a French version of Miranda Priestly from The Devil Wears Prada — is the worst offender.
At one point, Emily asks Sylvie to join her for lunch, to which Sylvie responds that she's just going to smoke a cigarette instead. Although Emily points out several times that smoking can cause cancer and heart disease, those facts are clearly lost on her French counterparts.
If your teen is going to watch the series, it could be worth a conversation with them about the perils associated with smoking cigarettes and Juuling.