I'm not sure what the law is in the PI regarding "Aroma Therapy" devices so I took a quick look at paraphernalia law. Here is an interesting section:
"Section 12. Possession of Equipment, Instrument, Apparatus and Other Paraphernalia for Dangerous Drugs. - The penalty of imprisonment ranging from six (6) months and one (1) day to four (4) years and a fine ranging from Ten thousand pesos (P10,000.00) to Fifty thousand pesos (P50,000.00) shall be imposed upon any person, who, unless authorized by law,
shall possess or have under his/her control any equipment, instrument, apparatus and other paraphernalia fit or intended for smoking, consuming, administering, injecting, ingesting, or introducing any dangerous drug into the body:
Provided, That in the case of medical practitioners and various professionals who are required to carry such equipment, instrument, apparatus and other paraphernalia in the practice of their profession, the Board shall prescribe the necessary implementing guidelines thereof.
The possession of such equipment, instrument, apparatus and other paraphernalia fit or intended for any of the purposes enumerated in the preceding paragraph shall be prima facie evidence that the possessor has smoked, consumed, administered to himself/herself, injected, ingested or used a dangerous drug and shall be presumed to have violated Section 15 of this Act."
Have fun at Shoe Mart, don't look like you have money (hard to do if you are white since they assume you do), don't get kidnapped, don't draw undue attention to yourself, stay in groups and stay safe
More interesting reading here:
http://www1.umn.edu/humanrts/research/Philippines/RA_9165.html