Jed;

with all due respect, smoking cigarettes and cigars is far more likely to cause cancer of the liungs, throat, or esophagus than smoking marijuana.

Marijauna has been prove to have medical applicationsl cigarettes do not. Pure tobacco, who knows? very few smoke it any more.

Smoking too much pot (daily consumption) will no doubt have a negative effect; so will doiing too much of anything over time. I know plenty of people, myself included, who smoke marijuana occasionally (once a week or less) and are intelligent, and highly produtive members of society...they miss less work from illness than cigarette smokers, for one thing...and certainly are much healthier than alcoholics...