From the perspective of an addict and poly drug user, weed is relatively harmless. My personal DOCs are heroin, methamphetamine or mdma, powder and crack cocaine (smoked and injected), and I'm a heavy drinker. I use needles to do drugs, mostly intramuscular injections but sometimes IV. Alcohol is nearly the worst, in regards to both health effects and general societal problems, but a lot of that is how normalized and widely available it is. Generally speaking; weed, milder pure pharma grade opioids (hydro and oxycodone, dilaudad, etc. Anything that isn't crazy potent like fentanyl and its analogs or the newer nitazines that we're seeing in the street drug supply) naturally derived poppy extracts (opium, heroin) are MUCH less dangerous and damaging than more potent and harmful substances and alcohol. So, it really comes down to a matter of perspective, what you're comparing it to, etc.