I recently watched an episode of "Judge Judy" where the guest of the tenant was smoking a cigar on the balcony and somehow caused a fire.

Cigarettes are legal, and it is legal for landlords to bar the use of cigarettes in their properties.I would assume that if a tenant has a prescription for medical marijuana the landlord must accept the use of marijuana, just as a landlord must accept a medical use pet. 

For instance, if every time you come, you say, "While I'm here, I'd like to check all the faucets and toilets and outlets again, just to be thorough... and I might as well also test the smoke detector battieries while I'm here...and can you turn on the stove for me to be sure it's heating, and all the burners, and are all the windows opening?????

I'm wondering if I should provide some sort of disclosure about the smoke detectors, water heater and renter's insurance?

Have you ever been evicted, have you filed bankruptcy, do you smoke, how much do you make, etc. 

These cannot be elective procedures such as plastic surgery, but can be things like smoking cessations programs, dental work, laser eye surgery, braces for children, etc.6.  

Did you smoke something prior to this post?

Or is that smoke and mirrors for discrimination?

Other reasonable accommodations to consider would be visual doorbells, visual smoke/CO detectors, and allowing hearing assistance animals.

With rent subject to change... what if you start the "non-smoker" out at a lower rent rate and they turn out to be a "smoker" or take up smoking later?