vicious cycle
A circular process that requires one to do perform an action that has some effect and as a result requires the same action to be done again.
Example:
Every time I pulled a tissue out of the box more dust was stirred up which caused me to require yet another tissue- a vicious cycle.
The more sweets I ate the more my sweet tooth grew.
Every time I pulled a tissue out of the box more dust was stirred up which caused me to require yet another tissue- a vicious cycle.
The more sweets I ate the more my sweet tooth grew.