Last time I checked glue and paint thinner were available at any hardware store.
Many people use these substances in a safe and healthy manner. ( I happen to repair furniture in my spare time.) Ultimately it is up to the individual to do just that with any substance.
Given the fact that MJ use or abuse has never caused a death (Unlike glue or paint thinner) why would you possibly support the prohibition of a substance many use in a safe and healthy manner.
The glue is behind the counter and the thinner is removed in most cases from the work environment because of all the cancer it caused workers.
Now it has to be handled differently than twenty years ago.
Pot has killed tons of people and caused a tons of violence. Go take a trip to any see any violent offenders in prison and you will see they were all big marijuana fans who mixed that drug with other stuff and then got violent.
Pretty much all the jailed offenders have nice pot habbits.