Figure 2.
pH profile of the water vessel as a function of the sum of smoked waterpipe tobacco heads. Following the consumption of the second tobacco head, the pH stabilizes at around a value of 3.5.
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.