Yes, when they buy it illegally. You don't know what's in it. I feel the same way about other illegal drugs. Keeping them illegal only causes more deaths IMO. Also criminals are making tons of $$ off those illegal drugs. IMO some folks don't realize that caffeine (for instance) is itself a drug. Too much can kill.
We saw what happened during prohibition. There was 'toxic moonshine' with stills using lead coils, some bootleggers added iodine, creosote and embalming fluid.
At the time, the Prohibition Bureau intentionally made 'undrinkable' alcohol by adding soap. The Feds also intentionally poisoned industrial alcohol (which people turned to). They wanted to scare people with added wood alcohol, benzine, cadmiun, iodine, zinc, mercury, etc and all they did was end up killing folks.
I just think we haven't learned anything.