I know that alcohol isn't as safe as most People think, but there are still a lot of worse stuff out there.
All it ever takes is for an addict to just stop, and they're not just harming themselves anymore but another, and they should have help with that, and if they don't stop then that could be punishable by law.
Most of the time stopping cold turkey wont kill you and continuing to take the drugs is far more dangerous. And I smoked for about a year in high school and just decide to stop one day. It's not easy, but it really is just down to your own willpower. Same goes for any other drugs. People can do a lot of things if they only put their mind and willpower to it.