I don't have personal data that I've collected, but those are association studies at large population levels that look at people at baseline one, and then look at people at baseline two, at a follow-up time period.
There is this association, but what those studies cannot tell us is whether this is something along the way, such that somebody was basically experimenting with a lot of things and would have experimented with it no matter what. You cannot say that it's causing them to then go on to the next drug.
There has been a big debate in the field, whether it's tobacco or cannabis, about this idea of gateway drugs. Essentially, yes, I think we do see the association that occurs, but given the way the data is collected, we cannot yet say that because people tried it, it caused them to go on to become tobacco users.
I think that in general it has to do with availability, so if there were no cigarettes on the market, then maybe they would remain with vaping. We've seen that in many cases people who have used it then go on to stop and don't go back.
I think the data is not 100% clear. We can see an association, but is there causation? I'd be very cautious if anybody says that being exposed to vaping products causes youth to become smokers.