Here's what we know:
* Early exposure: Garland was introduced to amphetamines at a young age, possibly as early as 13, by MGM executives. These were used to keep her energized and slim during long filming hours.
* Prescription dependence: By her late teens, Garland was prescribed barbiturates for sleep and anxiety, which contributed to her dependence on downers.
* Self-medication: Her troubled childhood and pressures of stardom led to self-medication and a dependence on alcohol and various other drugs.
Therefore, it's inaccurate to state a specific date when she "started drugs." It's more accurate to say she developed a complex relationship with substances over many years, beginning with prescription medication and escalating to self-medication as she faced the challenges of her career and personal life.
It's important to remember that Garland's addiction was a symptom of a larger issue, and that her story highlights the devastating effects of substance abuse, particularly in the context of the pressure-cooker environment of Hollywood.