Drugs for them is an escape. A way to "ignore" life.
When you think about it, the same applies for sleeping, eating, tv, internet.. They're all stuff that makes us happy and makes us lose track of time.
Sadly, most people spend most of their time (lives) on these previous 4. Always seeking ways to kill time or to entertain themselves.
Few are the people who live consciously, who set goals and pursue them. Who actually live.
Which one are you? Today, be aware of how you spend your time and don't drug your life away.