Cigarette is related to Deadly. Deadly is a synonym of Fatal. Fatal is related to Disease. Disease is related to Reaction. 
Device can be used for Purpose. Laser is a type of Device. 
Cigarette <--RelatedTo--> Deadly <--Synonym--> Fatal <--RelatedTo--> Disease <--RelatedTo--> Reaction 
Purpose <--UsedFor-- Device <--IsA-- Laser 