I am both a parent and a grand parent.
What a great opportunity this is for you to have "that talk" that you always hear those in power telling young adults to have with their parents. I think that it would be wise for you to also understand that your parents were brought up believing what the government was telling them. We now know that we the people can not trust the government when it speaks to us.
There is plenty of research to go over with your parents to help them at least try to quell their paranoia and fear. Show them inportant websites like.......
www.lindesmith.org
www.drugwarfacts.org
www.drugwardistortions.org
and many other websites with very good honest information and research are linked to these sites.
Your parents will probably feel safe in their denial when you start to present this information to them, but as a parent i know that truth will overcome any obstacle we parents face. Is it a good thing to smoke pot at 16? 15? That depends how you were raised. Many cultures around the globe use cannabis and other substances with their children starting as early as 3 and 4 years old. Here in america we have been lied to and the truth is being distorted and in some cases, like th studies Nixon had done, are with held from public view. We did find out later what those trudies recommended. The studies President Nixon had done conlcuded that cannabis did not pose a threat to those who used it. Cannabis did not pose a threat to our children. Cannabis did not pose a threat to our national security. Cannabis did not pose a threat to our society. The studies and research concluded that ll penalties for the use of cannabis be eliminated and that cannabis be legal. Nixon and the usa government hid those studies and told the researchers to "go back and get it right". Talk to your parents.Help them along the way. Do it slowly and passively. They have years and years of programing that needs reprogramed.
Unteaching beliefs is harder than teaching them, unfortunately.
Good luck. This is also a great opportunity to teach one another in your home patience and understanding. Take advantage of it.

peace,
dai*ma :thumbsup: