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I hate to be the one to break this to you, but it is very likely that your teenage kids already have access through someone to marijuana [0], regardless of its legal status in your state.

The question you need to ask yourself isn't whether or not your teenage kids - soon to become independent adults - will try weed. The question is, do you want them to be educated about potential harms and get ID'd until they turn 21, or risk them getting an illegal product that isn't tested from a violence-ridden cartel (that doesn't check IDs, by the way)?

I highly recommend that you educate yourself about this drug, as I'm not sure of what scale of harmfulness cannabis can be classified as a "hard drug" [1]. The New York Times' 2014 editorial board's writeup on this issue is thoroughly documented and excellent [2].

[0] https://www.drugabuse.gov/publications/drugfacts/high-school...

[1] https://en.wikipedia.org/wiki/Drug_harmfulness#/media/File:2...

[2] http://www.nytimes.com/interactive/2014/07/27/opinion/sunday...