What are the major drawbacks of using a credit card versus a debit card?

Cons of credit cards

There's a danger of spending more than you can afford. A credit card has a set limit, but it might be more than what your budget allows. ...
You pay interest when you carry a balance. ...
Late payment fees can stack up. ...
They can hurt your credit score.

Why do poor people use debit cards?

First, debit cards lower the indirect transaction costs of accessing money in an account by facilitating more convenient access via a network of ATMs. Second, debit cards reduce the indirect cost of checking balances, which enables individuals to verify that banks are not unexpectedly reducing balances.