Final answer:
Drinking alcohol at the age of 19 can lead to legal consequences for a teen. Using over-the-counter medication or medication prescribed to the teen is generally not illegal. Smoking cigarettes at the age of 19 may have health consequences, but is not illegal.
Step-by-step explanation:
The decision that could lead to legal consequences for a teen is drinking alcohol at the age of 19. In many countries, the legal drinking age is 21, so consuming alcohol at 19 would be against the law and could result in legal repercussions. Using over-the-counter medication or medication prescribed to the teen would not typically lead to legal consequences, as long as they are being used responsibly and as directed. Smoking cigarettes at the age of 19 may have health consequences, but it is not generally illegal.
Learn more about Legal consequences of teen behavior