Guerlain - Habit Rouge EDT - All Time Classic 10/10. So, the word is on the grapevine that Guerlain is coming up with a new flanker for their classic, Habit Rouge. L'Instinct is the name, and it features a green heart, including a cannabis note. The initial impressions I've read haven't been overly complimentary. But … Continue reading Reviews – Guerlain – Habit Rouge