Mass. Gen. Laws ch. 94G, § 13
Penalties
(i) Whoever furnishes marijuana, marijuana products or marijuana accessories to a person less than 21 years of age, either for the person's own use or for the use of the person's parent or another person shall be punished by a fine of not more than $2,000 or by imprisonment for not more than 1 year or both such fine and imprisonment.
For the purposes of this subsection, ''furnish'' shall mean to knowingly or intentionally supply, give or provide to or allow a person less than 21 years of age, except for the children and grandchildren of the person being charged, to possess marijuana, marijuana products or marijuana accessories on premises or property owned or controlled by the person charged.
This subsection shall not apply to the sale, delivery or furnishing of medical marijuana pursuant to chapter 94I.