1. Thanks, but I prefer snorting caustic soda.
2. Thanks, but some nice men in white coats told me I'm crazy enough without drugs.
3. Thanks, but you won't like me on those.
4. I already feel good and I don’t want to mess it up.
5. No, I already eat too much junk food.
6. I'll pass.
7. Nah, I have plans today.
8. No, I'm already weird enough.
9. I'm saving my body for sports!
10. I don’t believe in using that stuff.
11. Nope, don’t want the hassle.
12. I don’t take chances with my body.