Reply #15: It depends what's in the smoke and how it is used

[notesdev]

You have to realize that pot smoking isn't like cigarette smoking... in general people don't smoke pot 20+ times a day as is common with cigarettes. Pot smoke is an extremely complex combination of compounds, the overall effects of which on the human body we don't fully understand. Just as there are some substances which will cause cancer in a very very short period of time, there are others that may technically contain trace carcinogens but the exposure period necessary to trigger cancer is longer than the human lifespan.