I just want to point out, we have to compare damage only when both drugs in comparison are used with the same frequency.
Otherwise we could say that 15 cofees a day are more damaging than a small shot of heroin once per month and conclude that coffee is more dangerous than heroin. One would think this is so obvious, but to many people it really isn't, I've heard countless people say "man, when I was smoking weed I was much worse than now I do mdma/coke". They somehow forget they did 10 doses (blunts) of weed a day, while they do one dose of cocaine per week, obviously then weed will make you dumber than coke.
Otherwise we could say that 15 cofees a day are more damaging than a small shot of heroin once per month and conclude that coffee is more dangerous than heroin. One would think this is so obvious, but to many people it really isn't, I've heard countless people say "man, when I was smoking weed I was much worse than now I do mdma/coke". They somehow forget they did 10 doses (blunts) of weed a day, while they do one dose of cocaine per week, obviously then weed will make you dumber than coke.