Biological is related to Plant. Plant is related to Pot. Pot is a synonym of Smoke. 
Interest is related to Charge. Charge is a synonym of Commitment. Commitment is a synonym of Responsibility. 
Biological <--RelatedTo--> Plant <--RelatedTo--> Pot <--Synonym--> Smoke 
Interest <--RelatedTo--> Charge <--Synonym--> Commitment <--Synonym--> Responsibility 