Risky is a synonym of Dangerous. Smoke can be Dangerous. Smoke is related to Habit. 
Chin is the opposite of Forehead. Forehead is a synonym of Face. Face is a type of Cover. 
Risky <--Synonym--> Dangerous <--HasProperty-- Smoke <--RelatedTo--> Habit 
Chin <--Antonym--> Forehead <--Synonym--> Face --IsA--> Cover 