Is it true smoking one joint of marijuana is like smoking ten cigarettes?

smoking either  is  soft

Cigarettes often have filters on them. You can roll your own, or specifically buy ones that don't have filters. I think Lucky Strike brand used to have cigs without filters.

Joints typically don't have filters. Not like a cigarette does. You can put a filter from a cigarette on a joint, but this is unpopular because the resin in marijuana will quickly create a film over the end of the filter that the weed is in contact with. It's explained saying it clogs the filter. It blocks optimal inhalation.

Cigarettes have tar in them, and joints have resin. Both are sticky brown/black substances. Neither is good for optimal lung health.

Marijuana smoke is often considered to be more pure and less toxic than cigarette smoke. Marijuana users typically hate to hear anyone say *anything* bad about marijuana. The truth is pot isn't perfect.

The negative side effects of smoking is one reason that pot edibles have a market, and are popular. Smoke free way to get similar effects / achieve desired benefit.

Lungs are not made for smoking. Inhalation of smoke, air pollution, or other contaminants is not good for lung tissue. Plain and simple. Your lungs were evolutionarily designed to breath plain old clean fresh air.

I think this is propaganda. In India, a lot of people smoke Marihuana the whole day their whole life and they do not face certain late effects like from cigarettes. 

Not at all.   It's funny how wrong that is. 

Cigarettes are being phased out. 

Marijuana is legal in more and more places. 

There's a reason. 

As far as the intake of tar and cancer causing ingredients one decently sized marijuana cigarette contains as much tar and nasty crap in it has about 10 cigarettes.

But marijuana doesn't have the nicotine