I would sell the house and all the contents (furniture, appliances, electronics, kitchen gadgets, linens, vacuum cleaner, everything).I'm asking 3x my actual purchase price for the house and contents. 

Other cool gadgets were rice cooker, fast electric boil kettle and the microwave.

It is more profitable than parking funds in banks, buying cars or electronic gadgets, as real estate value increases exponentially compared to bank interest.

Your lease should say no smoking or vaping (of any product) and should include penalties for violating the rule.

“vaping”).

Then again its your property so do what you feel is fit but I will say, I respect smoking outside more then vaping your strawberry apple vape inside which I'm sure most of your tenants do given they are mostly students. 

and Doing something different like vaping or bong or something else like that?

There is a $2 gadget at Wal-Mart or Home Depot called "zip tool?"

Also do not waste money on toys, electronic gadgets, cell phones, cable TV,  etc at this point in your life are a waste of good money.  

You investment rehab better have some wi-fi gadgets incorporated as well as the latest state of the art security and maintenance or guess what?