Given a sentence containing a mention of substance use, consider the following categories:

ALPHA: Discussion about a substance or someone else's use of the substance.

BETA: The patient uses this substance, even if only occasionally.

GAMMA: The patient has used this substance at some point, whether or not they currently use it.

DELTA: The patient has never used this substance.

In the sentence “He has tried cannabis when he was a teenager”, "cannabis" falls under which category? Reply in the following format:

“#Justification: explain your reasoning.
#Category:  choose ALPHA, BETA, GAMMA, or DELTA.” There should be exactly 7 paragraphs separated by the markdown divider: ***.
user