Disadvantages of quoting integers in a Mysql query?

Question

I am curious about the disadvantage of quoting integers in MYSQL queries

For example

SELECT col1,col2,col3 FROM table WHERE col1=\'3\';

Answer 1

According to me, I think there is no performance/size cost in the case you have mentioned. Even if there is, then it is very much negligible and wont affect your application as such.