Cannabis use can cause cancer/carcinogen and tar content:We have all heard that cannabis has more tar and carinogens than tobacco. Just like the potency statistics, they rely completely on what is seized which makes it unreliable data. What is reliable data is the fact that all smoked plant material contains tar and carcinogenic exhasts as well as carbon monoxide. Yet study after study has failed to link cannabis use with an increased cancer risk when tobacco use is controlled.
The reason for this is THC and CBDs anti-oxidant, and anti-carinogenic qualities. THC and CBD have been proven to reduce the size of cancerous tumors and kill canerous cells without effecting healthy tissue in both lab animals and human subjects. [Note: Smoked cannabis will not cure cancer, yet there have been shocked physicians who noticed that the tumor that once showed up on an x-ray of their pacient's lung had disappeared after the pacient started using cannabis through a vaporizor.]
That brings me to the vaporizor option. A vaporizor completely mitigates the harms of smoking by providing a method of cannaboid delivery without combustion. It works by heating up the active ingredients, or cannaboid to a temperature lower than combustion temperture. The user gets no tar, carcinogens, or carbon monoxide when using a high quality vaporizor properly.
For those who are tight on cash or would rather spend money on herb than devices to smoke herb, (although a good vap. could start at 150) you could always consume cannabis through digestion. Through the use of tinctures, teas and the good old pot browies.