Person wants (to) Tobacco. Person wants (to) Commitment. Commitment is a synonym of Obligation. 
you are likely to find Fruit in/at/on Jar. Mouth is part of Jar. you are likely to find Water in/at/on Mouth. you are likely to find Water in/at/on Dip. 
Tobacco <--Desires-- Person --Desires--> Commitment <--Synonym--> Obligation 
Fruit --AtLocation--> Jar <--PartOf-- Mouth <--AtLocation-- Water --AtLocation--> Dip 