It's bundled in the "Basics of farming" skill. You will also need a permission to use the seed bench in front of Billy's house.
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When you use a drug / drink alcohol, you get a number of invisible addiction points. Every week, you lose some mood and one addiction point. You stop losing mood once all addiction points are gone.
So if you drink two beers in one week, then you will lose mood two weeks in a row.
Drugs / alcohol give you more mood than what addiction takes from you every week, so if you keep drinking every week, you will get more mood than what you lose. Doing this long term will give you a lot of addiction points and running out of drugs can poentionaly lead to game over, unless you find a way to offset the long term mood loss.
Bear should have positive outcome. Drinking it gives you +10 mood. Beer addiction takes -5 mood. If you drink beer every week, you will be gaining a lot of mood. Once your character gets older, you will be able to drink multiple beers before you get drunk.
As for cooking, only Tier 1 jobs are in the game right now.