If you live in a state where it is legal to smoke medicinal weed, you still need to be aware of your local marijuana laws. You may have an encounter with a law enforcement officer, and you need to know your rights. When you medicate, make sure you use common sense. Marijuana obviously has a distinctive smell, so try to avoid being in public after you smoke. If you are driving, get pulled over and the officer smells weed, it could lead to an embarrassing situation. Also remember that even if your weed is legal, it’s still illegal to drive under the influence.
Some of the most common policy questions regarding medical marijuana include how to regulate its recommendation, dispensing, and registration of approved patients. Some states and localities without dispensary regulation are experiencing a boom in new businesses, in hopes of being approved before presumably stricter regulations are made. Medical marijuana growers or dispensaries are often called "caregivers" and may be limited to a certain number of plants or products per patient. This issue may also be regulated on a local level, in addition to any state regulation.
Cannabis smoke contains thousands of organic and inorganic chemical compounds. This tar is chemically similar to that found in tobacco smoke,  and over fifty known carcinogens have been identified in cannabis smoke,  including; nitrosamines, reactive aldehydes, and polycylic hydrocarbons, including benz[a]pyrene.  Light and moderate use of cannabis is not believed to increase risk of lung or upper airway cancer. Evidence for causing these cancers is mixed concerning heavy, long-term use. In general there are far lower risks of pulmonary complications for regular cannabis smokers when compared with those of tobacco.  Combustion products are not present when using a vaporizer , consuming THC in pill form, or consuming cannabis edibles .