health issues completely aside, whether something is right or wrong or not is determined by culture. it's often illegal to puff, but that doesn't change the ideology of the cannabis culture, which celebrates pot in spite of laws. however there's also cultural prescriptions on a convivial level, that is to say in the family, which in your case may or may not be against the use of cannabis. until you get to the age that you separate yourself from the restraints of family allegiance, it's best to do whatever will appease the culture that exists within the walls of your family's house. of course, this is coming from someone who smoked intermittently since the age of twelve and never raised many parental concerns. it's up to your judgement and ability to maintain a normal appearance while stoned.