I'm a 21 college student, who recently started to try coke. Everyone freaks out about it, why is it so bad?

I don't use alot, maybe a couple times a a mth, andalways so the same amount 1/4 of a gram. I only do it on the weekends when I have gotten all of my work done. It's enjoyabe to me, but it seems like some people think it really bad. I know it's not good for your heart, but still don't see the big deal. Alot of websites just give information that dosent really affect my houghts on it. I know it is addictive, but if I can maintain small doses, what is the harm? I got concerned this summer durring the first two months of doing it that I might unknowingly be addicted, so I just decided to stop untill ocober came around, then last week realized that it was October and was not counting down the days till I could do it. I really enjoy it from time to time in moderation and just don't see the problem for myself. Some advice please, oh and please be constructive I'm looking for some logical advice/ knowledge to see if it's as big of a deal as some articles I've been reading. Thanks!