Dangerous/unhealth/addictive are three different things! I specifically said alcohol is more dangerous and unhealthy.

Judging from the number of users who say they would like to stop using it but can't, cannabis is more addictive, however. There are plenty of surveys of this, and I've seen even cannabis activists take them seriously, advocating offerings to cut down/quit similar to those we offer to smokers.

I don't know why, and this is just one possible measure of addictiveness, but it is what it is.