Marijuana is not a gateway drug.
Having to deal with a drug dealer that wants to also sell you actually addictive drugs is the gateway.
Legalize pot, sell it at the grocery store, and you will watch the number of addicts in general fall precipitously. I guarantee it.
The question isn’t whether Marijuana is habit forming. Obviously for some percentage it is. The question is whether Marijuana use in and of itself encourages or preface additional drug use. My position is that it does not and by legalizing Marijuana we would find that it is the interaction with black market drug dealers which correlates instead.