bake? No matter what it's called it is using drugs, most likely weed with all the eating going on.
My 7 years of working in the group-home prompts me to give out advice.
If using drugs is OK with you, you think it is harmless, think again.
Get some home UA kits and get a pee sample first thing in the morning. “First thing in the morning samples” wil quickly tell what is going on and are less prone to outside influences. Signs of trying to invalidate the test results by your s are; drinking lots of water, taking nutritional supplements, using bleach to throw the results off. http://onpointhealth.smartsontap.com/health/drug-testing.html
Bored and nothing to do is the first sign of trouble. Not enough creativity on his or your part. Lots of kids find things to do w/o resorting to drugs.
Aside from the legal problems, one drug can lead to other drug usage. Once drug usage goes beyond a certain point, lots of times people support their habit by selling or stealing.
If your s wants cookies, he needs to make his own. It gives him something to do. Your d making cookies for him, that is enabling behavior.