Interior of the car smells like weed?

No one has ever smoked weed in my car before and I haven't either but I'm really curious on why the interior smells like weed usually. Also I have owned this car for years, it's a 2001 Honda Prelude.

Added (1). Why does the interior of my car smell like weed?

Yellow goo on oil cap. Should I change the engine oil?

I just did a oil change back in August with full synthetic 0W-20 and a new filter. It's been getting cold recently and upon opening the oil cap on my Honda, there's yellow goo on the cap. Antifreeze level is the same as usual(not blown head gasket). Car has no oil leaks what so ever.

Should I change the oil because condensation had formed in the oil case? On my last car I didn't and it ended up ruining the oil and blowing the piston rings, but is it possible to just drive til it's burned off?

How much to build a motor?

Just want a ball park of labor cost to build the internals of a motor or honda motor. Located in California. I want to go all motor build and put in aftermarket pistons, rods, camshaft, valvesprings/retainers.

Engine Light Came Back On?

I have an 05 Honda Coupe with a 2.4 manual, but as I was driving it one day the engine light came on. Took it down to the mechanic and they scanned the code and found it was an oxygen sensor. Light when away after replacement. Day later the engine light came back on.

Should I buy it? 1973 Honda CB360G?

There's a really nice working 1973 Honda CB360G in my area listed for only $600 dollars. Should I go for it? Heres a pic. Even if I do buy it and don't like it I could sell it and make profit right? Should I buy it 1973 Honda CB360G