[Mariner]

99.999% of all pot smokers never go on to heroin.

Why are you trying to establish a link between the two?

[JimRed]

99.999% of all pot smokers never go on to heroin.

Source, please?

Or how about rewording it "99.999% of all pot smokers never go on to other drugs and see if it fits?

[Badboo]

Lets make this accurate for you. 99.99% of all addicts have used pot.

The vast majority of all teenage opiate ODs began their fall into the drug culture with pot.

Now that we have established that pot is a major gateway drug, we can return to your drug culture enabling defenses. Your grandparents would be so proud of you.