Demi has battled with her own drug and alcohol demons in the past and has previously been open about the effects those addictions had on her self-esteem and her career.
And now she feels that her fellow celebrities, as well as the film and music industry, have a responsibility to "spread the word" and "raise awareness" too, instead of making drug use appear "cool or admirable".
Writing in a lengthy Twitter post yesterday (3 February), Demi said: "I wish more people would lose the stigma and treat addiction as the deadly and serious DISEASE that it is. Drugs are not something to glamorise in pop music or film to portray as harmless recreational fun. It's not cute, "cool" or admire able.
"It's very rare when people can actually predict their addiction and even then, you never know when too much is going to take their life or take a bad batch of whatever it is they are using.
"It's time people start really taking action on changing what we're actually singing/rapping about these days because you never know if you could be glamorising a certain drug to a first time user or alcoholic who could possibly end up dead because they end up suffering from the same deadly disease so many have already died from."
The former X Factor judge and chart-topping pop singer then went on to mention the recent death of award-winning actor Philip, who was found dead in his apartment on Sunday (2 February).
Demi added: "This stuff is not something to mess with. Why risk it? Addiction IS a disease. Please spread the word so we can take the taboo out of discussing this illness and raising awareness to people of all ages.
"RIP Philip Seymour Hoffman.. An INCREDIBLE artist who lost his life to this horrible disease.. May you rest peacefully and in complete serenity now that your pain is gone. God Bless..."
Philip - who has a history of drug and alcohol abuse - reportedly died from a drug overdose, according to multiple sources.
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