Most people I know around me aren't really even smoking it anymore, they're vaping it, mostly CO2 extracted oils, or eating it. At lower temps with no benzine, ash, or other carcinogens and may be relatively safer by comparison. It may be less harmful than the air you breathe every day in most cities. Nobody knows yet if vaping paralyzes cilia but it is highly unlikely based on experiences. Personally, I vape a full range of cannabinoids with a CBD:THC 1:1 ratio, but not every day and sometimes not even once a week.
CBD is both anti-psychotic and may even be anti-inflammatory as a compound, and is showing promise in anti-cancer research (long list of links to research). Anti-inflammatory is anti aging ya know. Cannabis is also one of the lead candidates recommended for use in opioid recovery. A balanced level of cannabinoids can literally remove all the anxiety associated with THC, canceling out the "paranoia" effect and may even block the short term memory effects that otherwise occur. The temp is below any carcinogenic level. In the end, there is *still* not enough research because of prohibition to make any negative or even positive health claims at this time. To take such a negative, anti-marijuana stance right now is at best premature and at worst, really annoying, since alcohol does far worse than any other drug. Any negative claims have been slanted by just as much propaganda bias as positive claims may have been.
The DEA has a lot of stake in keeping their "jobs" of being the world's worst bullies and Jeff Sessions, the worst human being on the planet, is leading another witch hunt against dealers and users, including those in legal states. Leaving countless lives ruined in his wake. The war on drugs is not only a confirmed race war in motive but an atrocity on par with any genocide in history, both directly and indirectly. Prohibition is the worst kind of solution to a problem that never was, because it only ended up creating the problems it was intended to solve, as usual. Just like alcohol prohibition, any prohibition is a self-fulfilling prophesy that destroys more lives than it saves. The FDA is not innocent in doing the same with its extensive regulatory barriers to progress. If you want access to drugs so you can stop aging, you should be all about ending the drug war, the DEA and the FDA.
Is this post off-topic? Not if it's about the availability of drugs, because the FDA and DEA stand in the way of progress and our access to present day anti-aging medicine.