Bad idea.
You should never rely on chemicals to make you feel better.
What if it makes you look cool? o:
Just don't swear, use gentler words in place of them.
If someone thinks you're stupid for not swearing, don't worry, you know they're silly for swearing.
It get's you no where and it's anti-social.
When there's so many words in the English language, you don't need to resort to the same 4 lettered words again and again.
And if you just need to release stress, then just find something that is comforting and relaxing for you.
Don't go playing online games if you get stressed with people.
Pick up a puzzle, or a book, or go for a calm bike ride.
Taking a nap is also a good way to calm down, and just relaxing in a serene environment will allow you to think clearly, feel better and release your stress.
You won't be such a negative person if you take a little time for yourself.
Set yourself a time when you can just relax and not worry about your life.
Also of note, although it may sound silly, procrastination is a really good stress reliever.