You shouldn't become an alcoholic.
John is a newly hired wine taster.
John wants to become very knowledgeable about different types of wine.
John tastes a lot of wine for his job, but he spits it out rather than swallow it.
John drinks a lot of wine every day for his job and becomes addicted to it.
John expands his knowledge of wine considerably and gets offered a better job at a fancier restaurant.
John sleeps frequently because he's hungover and gets fired from his job.